add contributing guide

CONTRIBUTING.md

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+# Contributing
+
+Thank you for considering contributing to the project! I welcome contributions from everyone.
+
+**NOTE: If you are looking to open a PR, please fork off of the `next` branch since that has the latest changes**
+
+## How to contribute
+
+- Fork the repo
+- Checkout the `next` branch `git checkout next`
+- Create a new branch for your feature `git checkout -b new-feature`
+- Start making changes and fixing things
+- Open a pull request [here](https://github.com/hzrd149/nostrudel/pulls)
+- Wait for feedback. it might take me a while to look at it
+
+## Guidelines
+
+- All code if formatted with prettier. you can run `yarn run format` to format the project
+- Write clear and concise commit messages
+
+## Issues and Bug Reports
+
+If you find a bug or have an idea for a new feature, please create an issue in our repository.
+Be sure to include a clear description of the problem or feature request, and what version you found the bug in. (either `nostrudel.ninja` or `next.nostrudel.ninja`)
+
+## License
+
+By contributing to this project, you agree that your contributions will be licensed under the project's [license](./LICENSE).