Create CONTRIBUTING.md

CONTRIBUTING.md

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+We welcome contributions to jam.coop in the form of bug reports, feature requests and/or code contributions. 
+
+To save you unnecessary work we encourage you to talk to us about your contribution first. You can: 
+* email us at [email protected]
+* talk to us on Mastodon [@freerange@ruby.social](https://ruby.social/@freerange)
+* join the [Fun Music Place discord community](https://discord.gg/VjKq26raKX) and find us in the jam.coop section
+
+Contributions to jam.coop are covered by our [code of conduct](https://github.com/freerange/jam-coop/blob/main/CODE_OF_CONDUCT.md).