Add dedicated documentation for contributing new or rule updates

Currently the contributing documentation is not easy to read. Let's provide clear instruction in the form of a dedicate walk though page that someone can follow end to end to contribute new or updated rules.

Examples:

- https://azure.github.io/Azure-Verified-Modules/contributing/bicep/bicep-contribution-flow/owner-contribution-flow/
- https://azure.github.io/Azure-Verified-Modules/contributing/terraform/terraform-contribution-flow/#53-release-branch-and-run-end-to-end-tests-owner