Create CONTRIBUTING.md file #17
Description
As a maintainer of an open-source project, I want a clear and helpful CONTRIBUTING.md document that explains how to contribute to the project, so that I can set expectations and explain how I'd like new code the be added to the project.
- Explain the values of the project
- Explain how to add a new icon (alphabetically)
- Explain the single responsibility principle (one change at a time, please)
- Explain that git commits don't really matter (we squash merge)
- Explain that new features should be discussed and agreed upon before a pull request will be accepted