docs: 📝 Create readme and add license

LICENSE

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+MIT License
+
+Copyright (c) [2023] [Louis Galet]
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# ShortMenu
+
+ShortMenu is a macOS application built with SwiftUI that allows users to shorten URLs. It provides a convenient way to generate shorter, more manageable links for sharing.
+
+## Features
+
+- Shorten URLs: Enter a long URL and click the "ShortURL" button to generate a shortened version.
+- Define API Key: Click the "Define API Key" button to open a modal window where you can enter your API key. The key will be stored securely in the macOS Keychain.
+
+## Requirements
+
+- macOS 10.15 or later
+
+## Installation
+
+1. Clone the repository:
+```
+git clone https://gitea.louisgallet.fr/lgallet/short-menu.git
+```
+2. Open the project in Xcode.
+
+3. Build and run the project in Xcode.
+
+## Usage
+1. Launch the ShortMenu application.
+
+2. Copy the long URL you want to shorten.
+
+3. Click the "ShortURL" button to shorten a URL.
+
+4. If you haven't defined an API key yet, click the "Define API Key" button. Enter your API key in the provided text field and click "Save".
+
+5. Paste the long URL everywhere you want to share it.
+
+## License
+
+[MIT License](LICENSE)
+
+## Acknowledgements
+
+ShortMenu is built using SwiftUI and makes use of the [Short.io API](https://short.io) API for URL shortening.
+
+## Contributing
+
+Contributions are welcome! If you have any suggestions or feature requests, please open an issue or submit a pull request.