docs: update Introduction section and add flowchart

docs/index.md

@@ -3,4 +3,63 @@ title: 'Introduction'
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-The AsyncAPI CLI is a tool you can use to work with your AsyncAPI documents. You can use the CLI to validate AsyncAPI documents, use the Generator tool, and even create new AsyncAPI documents.
+
+The AsyncAPI CLI is a command-line tool that provides developers with a set of commands for working with AsyncAPI documents. AsyncAPI is a specification for describing asynchronous APIs, which allows developers to define the structure of messages exchanged between different parts of their application. The AsyncAPI CLI simplifies the process of creating, validating, and manipulating AsyncAPI documents, making it easier to work with asynchronous APIs.
+
+## Features
+
+The AsyncAPI CLI offers the following key features:
+
+* Validation: AsyncAPI documents can be quickly and easily validated using the built-in validation tool, which ensures that the documents conform to the AsyncAPI specification and catches errors early in the development process.
+
+* Generator: New AsyncAPI documents can be created based on templates using the CLI's Generator tool, saving time and effort when creating new APIs and ensuring that they follow best practices.
+
+* Creation: New AsyncAPI documents can be created from scratch using the CLI, which is useful when starting a new project or needing to create a new version of an existing API.
+
+* Format Conversion: AsyncAPI documents can be converted between different formats, such as YAML and JSON, using the CLI, which can be useful when working with a tool that requires a specific format.
+
+* Templates: New AsyncAPI files can be quickly created using the CLI tool by selecting from a range of templates (MQTT, WebSockets, Kafka, and more).
+
+* Validation with Spectral: AsyncAPI documents can be validated with Spectral, providing feedback to verify that the document is within the correct format.
+
+To summarize, the AsyncAPI CLI offers the following features and process flow, as shown in the diagram below:
+
+```mermaid
+graph TD;
+A[AsyncAPI Document]
+B[Validation]
+C[Generator]
+D[Creation]
+E[Format Conversion]
+F[Templates]
+G[Spectral Validation]
+A-->|Validate|B;
+A-->|Generate|C;
+A-->|Create|D;
+A-->|Convert|E;
+A-->|Create with Templates|F;
+B-->|Validate using Spectral|G;
+
+```
+
+## AsyncAPI CLI Flowchart
+
+The following flowchart illustrates the process flow of the AsyncAPI CLI:
+
+```mermaid
+graph TD
+    A[Start] --> B[User runs the AsyncAPI CLI]
+    B --> C[User runs a command]
+    C --> D[CLI processes command and runs corresponding operation]
+    D --> |Is operation successful?| E{Yes}
+    D --> |Is operation recoverable?| F{No}
+    E --> G[CLI returns results of operation to the user]
+    F --> H[CLI exits with an error message]
+    F --> |Suggests possible next steps to the user | I[CLI displays error message]
+    G --> J[User receives results]
+    H --> J
+    I --> J
+    J[End: User closes the AsyncAPI CLI]
+```
+
+This flowchart shows the high-level process that occurs when using the AsyncAPI CLI. The user starts by running a command (such as `validate`, `generate`, or `info`), which is processed by the CLI. The CLI then performs the corresponding operation (such as validating or generating an AsyncAPI document), and returns the results to the user. If an error occurs, the CLI displays an error message and suggests possible next steps for the user to take.