Create CONTRIBUTING.md

CONTRIBUTING.md

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+# CONTRIBUTING TO GROUP UP
+## Things to check before committing a change
+- Formatting and linting
+  - Run `deno fmt` to set all formatting correct
+  - Run `deno lint` to check for any issues that need fixed
+- Are you making a change that will be updating the version number?
+  - Update the version number in `README.md` and `config.example.ts`, and update the date in `README.md`
+  - Create a tag on your commit marking this version (name it Vx.x.x)
+## Things to check after committing a change
+- Check in on Sonar to see if your commit caused new issues to appear.  If it did, please fix them