Add XML documentation for API interfaces

This commit introduces comprehensive XML comments to improve codebase clarity and maintainability. Detailed descriptions were added for all methods and properties across `ISubDBClient`, `IResponse`, `IRequest`, and `ISubDBApi` interfaces, outlining their purpose, parameters, and return values. These changes enhance API usability and developer understanding.

src/Http/IRequest.cs

@@ -3,10 +3,33 @@
 
 namespace SubDBSharp.Models
 {
+    /// <summary>
+    /// Represents an HTTP request with a specified endpoint, method, and optional body content.
+    /// </summary>
     public interface IRequest
     {
+        /// <summary>
+        /// Gets or sets the HTTP content to be sent as the body of an HTTP request.
+        /// </summary>
+        /// <remarks>
+        /// Typically used to include serialized data or other payloads in HTTP requests such as POST or PUT.
+        /// </remarks>
         HttpContent Body { get; }
+
+        /// <summary>
+        /// Gets or sets the URI that represents the target endpoint of the HTTP request.
+        /// </summary>
+        /// <remarks>
+        /// Used to specify the destination URL for the HTTP operation being executed.
+        /// </remarks>
         Uri EndPoint { get; }
+
+        /// <summary>
+        /// Gets or sets the HTTP method to be used for the request.
+        /// </summary>
+        /// <remarks>
+        /// Specifies the action to be performed by the request, such as GET, POST, PUT, or DELETE.
+        /// </remarks>
         HttpMethod Method { get; }
     }
 }

src/Http/IResponse.cs

@@ -3,10 +3,38 @@
 
 namespace SubDBSharp.Http
 {
+    /// <summary>
+    /// Represents a response received from an HTTP request.
+    /// </summary>
     public interface IResponse
     {
+        /// <summary>
+        /// Gets the content of the response body.
+        /// </summary>
+        /// <remarks>
+        /// The body contains the data returned by the HTTP request, which may be in various formats such as plain text,
+        /// JSON object, or binary data, depending on the nature of the response.
+        /// This property is represented as an object and may require casting to the expected type.
+        /// </remarks>
         object Body { get; }
+
+        /// <summary>
+        /// Gets the collection of HTTP headers included in the response as key-value pairs.
+        /// </summary>
+        /// <remarks>
+        /// The headers provide metadata about the response, such as content type, server, and other relevant information.
+        /// This property is represented as a read-only dictionary where the keys are the header names
+        /// and the values are the corresponding header values.
+        /// </remarks>
         IReadOnlyDictionary<string, string> Headers { get; }
+
+        /// <summary>
+        /// Gets the HTTP status code associated with the response.
+        /// </summary>
+        /// <remarks>
+        /// The status code indicates the outcome of the HTTP request, such as success, client error, or server error.
+        /// It conforms to the standardized status codes as defined in the <see cref="System.Net.HttpStatusCode"/> enumeration.
+        /// </remarks>
         HttpStatusCode StatusCode { get; }
     }
 }

src/Http/ISubDBApi.cs

@@ -3,11 +3,39 @@
 
 namespace SubDBSharp
 {
+    /// <summary>
+    /// Interface for interacting with the SubDB API to perform operations related to subtitle management.
+    /// </summary>
     public interface ISubDBApi
     {
+        /// <summary>
+        /// Downloads a subtitle file based on the provided video hash and language preferences.
+        /// </summary>
+        /// <param name="hash">A unique hash representing the video file, generated using a specific hash function.</param>
+        /// <param name="languages">A list of language codes indicating the preferred languages for the subtitle. The first matching language is returned.</param>
+        /// <returns>A Task representing the asynchronous operation, containing the server's response to the subtitle download request.</returns>
         Task<Response> DownloadSubtitle(string hash, params string[] languages);
+
+        /// <summary>
+        /// Retrieves a list of available languages supported by the SubDB API for subtitles.
+        /// </summary>
+        /// <returns>A Task representing the asynchronous operation, containing the server's response with the list of available languages.</returns>
         Task<Response> GetAvailableLanguagesAsync();
+
+        /// <summary>
+        /// Searches for subtitles based on the hash of a video file, optionally returning the number of subtitle versions available per language.
+        /// </summary>
+        /// <param name="hash">The hash of the video file, uniquely identifying it in the subtitle database.</param>
+        /// <param name="getVersions">Optional parameter to indicate whether to include the number of versions available for each subtitle language.</param>
+        /// <returns>A Task representing the asynchronous operation, containing the server's response to the subtitle search request.</returns>
         Task<Response> SearchSubtitle(string hash, bool getVersions = false);
+
+        /// <summary>
+        /// Uploads a subtitle file for a specific movie to the server.
+        /// </summary>
+        /// <param name="subtitle">The content of the subtitle file being uploaded.</param>
+        /// <param name="movie">The movie identifier or hash that the subtitle is associated with.</param>
+        /// <returns>A Task representing the asynchronous operation, containing the server's response to the upload request.</returns>
         Task<Response> UploadSubtitle(string subtitle, string movie);
     }
 }

src/ISubDBClient.cs

@@ -3,11 +3,46 @@
 
 namespace SubDBSharp
 {
+    /// <summary>
+    /// Defines methods for interacting with the SubDB API,
+    /// including operations for downloading, uploading, searching subtitles,
+    /// and retrieving available subtitle languages.
+    /// </summary>
     public interface ISubDBClient
     {
+        /// <summary>
+        /// Downloads the subtitle for a given video file based on its hash and specified language preferences.
+        /// </summary>
+        /// <param name="hash">The hash of the video file, used to uniquely identify the video.</param>
+        /// <param name="languages">An array of language codes specifying the preferred subtitle language(s).
+        /// If multiple language codes are provided, the first available subtitle will be returned in the specified order.</param>
+        /// <returns>A task that represents the asynchronous operation. The task result contains the server response,
+        /// including the subtitle content and its associated metadata.</returns>
         Task<Response> DownloadSubtitleAsync(string hash, params string[] languages);
+
+        /// <summary>
+        /// Retrieves the list of all available subtitle languages currently supported in the SubDB database.
+        /// </summary>
+        /// <returns>A task that represents the asynchronous operation. The task result contains the server response,
+        /// including the list of available language codes.</returns>
         Task<Response> GetAvailableLanguagesAsync();
+
+        /// <summary>
+        /// Searches for subtitles for a given video file based on its hash.
+        /// Optionally, retrieves additional information about the subtitle versions available.
+        /// </summary>
+        /// <param name="hash">The hash of the video file used to uniquely identify the video.</param>
+        /// <param name="getVersions">A boolean indicating whether to return information about the number of subtitle versions per language available in the database.</param>
+        /// <returns>A task that represents the asynchronous operation. The task result contains the server response, including available subtitles and their metadata if found.</returns>
         Task<Response> SearchSubtitleAsync(string hash, bool getVersions);
+
+        /// <summary>
+        /// Uploads a subtitle file for a specific movie to the SubDB server.
+        /// </summary>
+        /// <param name="subtitle">The subtitle content to be uploaded.</param>
+        /// <param name="movie">The movie name or identifier associated with the subtitle.</param>
+        /// <returns>A task that represents the asynchronous operation. The task result contains the server response,
+        /// including status and any additional metadata related to the upload operation.</returns>
         Task<Response> UploadSubtitleAsync(string subtitle, string movie);
     }
 }