New contributing guidelines for fedora-happiness-packets

If you are working on the fedora-happiness-packets project for a Summer Coding project, check out the new contributing guidelines for the project:

These guidelines explain best practices to follow, goals for what this project’s purpose is, and how to submit changes that are quickly reviewed. Please use this as a reference when working on the project.

The guidelines might be expanded in the future. I suggest bookmarking the file if you are working on the project regularly. Additionally, improvements are also welcome. :slight_smile: