Create CONTRIBUTING.md

Add contribution guidelines.

CONTRIBUTING.md

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+# Contributing to Port
+
+Thank you for your interest in contributing to Port. When contributing to Port, make sure that the changes you wish to make are in line with the project direction. 
+If you are not sure about this, open an issue first, so we can discuss it.
+
+We use github to host code, to track issues and feature requests, as well as to accept pull requests.
+
+We want to make contributing to this project as easy and transparent as possible, whether it's:
+
+* Reporting a bug
+* Discussing the current state of the code
+* Submitting a fix
+* Proposing new features
+
+# Report bugs 
+We use GitHub issues to track public bugs. Report a bug by opening a new issue.
+
+Write bug reports with detail, background, and sample code. Ideally include the following:
+
+1. A quick summary and/or background
+2. Steps to reproduce
+3. Be specific!
+4. Give sample code if you can.
+4. What you expected would happen
+5. What actually happens
+6. Notes (possibly including why you think this might be happening, or things you tried that didn't work)
+
+# Code submission policy
+
+Pull requests are the best way to propose changes to the codebase (we use Github Flow):
+
+1. Fork the repo and create your branch from main.
+2. If you've added code that should be tested, add tests.
+3. Ensure the test suite passes.
+4. Make sure your code lints.
+5. Issue the pull request.
+
+# License
+Any contributions you make will be under the GNU Affero General Public License v3.0. In short, when you submit code changes, your submissions are expected to be under this license.