Add code of conduct
- By opening this merge request, you agree to release your code and all other changes under the GPL 3 license and to abide by the terms set by this license.
- Migrations have been added if applicable
- Significant changes of this merge request have been added to the changelog.
This is a code of conduct that is based off the Amethyst code of conduct. We should of had this quite a while ago, so it's good that I'm getting to it now