Added CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+As a product of the Genomic Knowledge Standards Workstream of GA4GH, the development of the projects and contributions of this repository are expected to hew relatively close to the standards utilized in [the VRS development process]((https://vrs.ga4gh.org/en/stable/appendices/development_process.html)). The additional information presented here are guidelines for issues, branches, commits, and pull requests. Before adding documentation, please also review the [docs style guide](docs/source/appendices/style.rst).
+
+## Discussions
+[Discussions](https://github.com/ga4gh/cat-vrs/discussions) are for discussion, design decisions, bug
+reports, and feature requests. When creating an issue, use sentence case
+for the issue title and avoid the use of periods at the end of titles.
+
+## Issues
+[Issues](https://github.com/ga4gh/cat-vrs/issues) are for used to track additions, bugs fixes, or other issues that are intended to be implmented, often as the outcome of a [discussion](https://github.com/ga4gh/cat-vrs/discussions). When creating an issue, use sentence case for the issue title and avoid the use of periods at the end of titles.
+
+## Branches
+[Branches](https://github.com/ga4gh/cat-vrs/branches) are used for
+versioning and feature additions. Version branches are to be created by
+repo administrators only. Feature branches must be associated with an
+open issue describing the desired feature, and named after the issue
+as <issue number>-<short-description>. For example, the associated
+branch for [issue 15](https://github.com/ga4gh/cat-vrs/tree/Issue-15) could
+be `15-bug fix`.
+
+## Pull Requests
+[Pull Requests](https://github.com/ga4gh/cat-vrs/pulls) (PRs) for new 
+features should target the `main` branch. For version 
+patches, the PR should target the appropriate minor version branch.
+PRs must be approved by at least one project maintainer before they may
+be merged. PR titles must reflect the issue associated with the PR. For
+example, the associated PR title for 
+[issue 15](https://github.com/ga4gh/cat-vrs/tree/Issue-15) would be
+`#15: fix Bug`.