aider: feat: Add README.md with project description and usage instruc…

…tions

README.md

@@ -0,0 +1,62 @@
+# envset
+
+`envset` is a command-line tool for setting environment variables in a .env file. It allows you to easily add or update environment variables without manually editing the .env file.
+
+## Installation
+
+You can install `envset` using Cargo:
+
+```
+cargo install envset
+```
+
+## Usage
+
+The basic syntax for using `envset` is:
+
+```
+envset [OPTIONS] <KEY1=value1> [KEY2=value2]...
+```
+
+### Options
+
+- `-f, --force`: Overwrite existing variables
+- `-o, --output <FILE>`: Specify the output file (default: .env)
+
+### Examples
+
+1. Set a new environment variable:
+   ```
+   envset API_KEY=myapikey123
+   ```
+
+2. Set multiple environment variables:
+   ```
+   envset DB_HOST=localhost DB_PORT=5432
+   ```
+
+3. Overwrite an existing variable:
+   ```
+   envset --force API_KEY=newapikey456
+   ```
+
+4. Set variables in a specific file:
+   ```
+   envset --output .env.production API_URL=https://api.example.com
+   ```
+
+## Features
+
+- Set one or multiple environment variables at once
+- Option to overwrite existing variables
+- Specify a custom output file
+- Preserves existing variables in the .env file
+- Trims whitespace and quotes from values
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit a Pull Request.
+
+## License
+
+This project is licensed under the ISC License.