Expand README with comprehensive setup and usage info

README.md

@@ -1,10 +1,69 @@
 # render50
 
-## Usage
+`render50` is a command-line tool from CS50 that renders and previews code or text files in a standardized, user-friendly format.
+
+---
+
+## Installation
+
+Install via `pip`:
 
+```bash
+pip3 install render50
 ```
-pip3 install cli50
-cli50
+
+Or install locally from source:
+
+```bash
+git clone https://github.com/cs50/render50
+cd render50
 pip3 install -e .
-./render50
 ```
+
+---
+
+## Usage
+
+```bash
+render50 [options] file [file ...]
+```
+
+### Example
+
+```bash
+render50 example.txt
+```
+
+Replace `example.txt` with the path to your file. Multiple files may be passed as arguments.
+
+---
+
+## Requirements
+
+* Python 3.x
+* Dependencies listed in `requirements.txt`
+
+---
+
+## Documentation
+
+Full documentation is available at:
+
+[https://cs50.readthedocs.io/render50/](https://cs50.readthedocs.io/render50/)
+
+---
+
+## Contributing
+
+Contributions are welcome. Feel free to:
+
+* Open issues
+* Submit pull requests
+* Propose new features
+
+---
+
+## License
+
+This project is licensed under the GPL-3.0 License.
+