doc: readme file

.github/FUNDING.yml

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+custom:
+  - https://boosty.to/artegoser/donate
+  - https://www.donationalerts.com/r/artegoser

README.md

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-# AnoPaper
+# AnoPaper - Notes service
 
+AnoPaper is a notes service that allows you to save notes locally, complete notes using OpenAI API, collaborate on notes with other users and more. The notes supports markdown, MathJax, and GFM syntax.
+
+Running on: <https://anopaper.artegoser.ru/>
+
+## Features
+
+- Save notes locally
+- Publish one-time notes (when read, the note is deleted from the server and saved locally)
+- Use OpenAI API to complete notes (with your own api key)
+- Collaborate with other users on notes
+- Synchronize data across devices
+- Support markdown, MathJax, and GFM syntax
+
+## Local installation
+
+- Setup repository
+
+```bash
+git clone https://github.com/artegoser/AnoPaper.git
+npm install
+npm run build
+```
+
+- Create a .env file in the root directory of the project with the following environment variables:
+
+  - PORT: The port on which the server will listen.
+  - KEY: Secret key to encrypt notes on the server
+
+## Contributing
+
+Contributions are welcome! If you would like to contribute to this project, please create a pull request.
+
+## License
+
+This project is licensed under the GNU General Public License v3.0. See the LICENSE file for more information.