Create CONTRIBUTING.md

Author: CaliCastle

CONTRIBUTING.md

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+# Contributing to _PopMenu_
+
+The following is a set of guidelines for contributing to _PopMenu_ on GitHub.
+
+> Thank you for considering making contribution to the project, this means a lot to me.
+
+## I want to report a problem or ask a question
+
+Before submitting a new GitHub issue, please make sure to
+
+- Check out the [documentation](https://calicastle.github.io/PopMenu).
+- Read the usage guide on [the README](https://github.com/CaliCastle/PopMenu/#usage).
+- Search for [existing GitHub issues](https://github.com/CaliCastle/PopMenu/issues).
+
+If the above doesn't help, please [submit an issue](https://github.com/CaliCastle/PopMenu/issues) on GitHub.
+
+## I want to contribute to _PopMenu_
+
+### Things to keep in mind
+
+- Please do not change the minimum iOS version
+- Always document new public methods and properties
+
+### Testing your local changes
+
+Before opening a pull request, please make sure your changes don't break things.
+
+- The framework and example project should build without warnings
+- The example project should run without issues.
+
+### Submitting the PR
+
+When the coding is done and you’ve finished testing your changes, you are ready to submit the PR to the [main repo](https://github.com/CaliCastle/PopMenu). Some best practices are:
+
+- Use a descriptive title
+- Link the issues that are related to your PR in the body
+
+## Code of Conduct
+
+Help us keep _BulletinBoard_ open and inclusive. Please read and follow our [Code of Conduct](CODE_OF_CONDUCT.md).
+
+## License
+
+This project is licensed under the terms of the MIT license. See the [LICENSE](LICENSE) file.