Needs infrastructure to be welcoming to new contributors

[thatandromeda]

Some combination, as appropriate, of:

• contributor license agreement
• contributors file
• guidelines for new contributors: community principles
• guidelines for new contributors: any process they need to be aware of concerning submitting a feature or patch
• guidelines for new contributors: what yaks do you need to shave to set up your development environment

[MaStr]

👍

[griffey]

Working on this! Matthias...we should chat re: the new repo, as it's much harder to manage a CLA across the multiple Repos, rather than a single repo with multiple folders. :-)