bare bones contributing guidelines

Author: bmeluch

CONTRIBUTING.md

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+## enviroMS Contributing Guidelines
+
+A work in progress.
+
+#### Steps to create a new version
+
+1. Protect feature branch.
+2. Set up Github mirroring (work with Yuri).
+3. The next push to feature branch will trigger Github Actions to run on that branch. Ensure those checks are passing.
+4. Bump enviroMS version using Makefile command (see semantic versioning guidelines).
+5. Merge feature branch into main on Gitlab.
+6. Use Github Actions to manually push the new Docker image to Dockerhub.
+7. Ensure Github checks now pass on main, using the latest Dockerhub image.
+8. Create a new release tag on Github.