Add content to CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,17 +1,65 @@
 # Contributing to hipFile/rocFile
 
-## Overview
+Thank you for contributing! This guide outlines the development workflow,
+contribution standards, and best practices when working on hipFile.
+
+> [!NOTE]
+> The ROCm libraries are transitioning to a monorepo system called [TheRock](https://github.com/ROCm/TheRock). hipFile has not been incorporated into this monorepo yet.
 
 ## Development Setup
 
+TBD
+
 ## Branching Model
 
-## Commit Messages
+The main development trunk of hipFile is the `develop` branch.
+
+hipFile generally uses trunk-based development, where feature branches
+are intended to be relatively short-lived. We do not, however, use the
+"branch by abstraction" pattern, where in-flight work is switched on
+and off by feature flags. Instead, when necessary, feature branches will
+be created and prefixed with `feature/`. These feature branches will
+be deleted after the feature has been merged to `develop`. Any feature
+branches which are not merged to `develop`, but should be kept around
+for posterity, will be renamed `feature` --> `inactive`.
+
+External developers must use forks for development. You will sometimes
+see branches from AMD staff named `<user>/<branch>`. These will be
+very short-lived.
+
+### Release branches
+
+Releases are tagged `vX.Y.Z`, where `X`, `Y`, and `Z` are the major,
+minor, and patch versions of the release.
+
+Releases occur from `develop`. Upon release, the tag is created and
+the minor version number is bumped. The major version number will
+only be bumped on `develop` when making an API/ABI-breaking change.
+
+Release branches are created retroactively and only when it is
+necessary to bugfix supported versions of the library. It is our
+intent to minimize the number of versions we support and features
+will normally not be brought back to minor releases of previous
+library versions. Release branches are not kept in sync with
+`develop` and just contain cherry-picks of bug and performance
+fixes.
+
+Bugfixing should take place on `develop` and be cherry-picked to
+any branches that are being maintained. The only exception to this
+is when a bug is only present on a release branch.
 
 ## Pull Requests
 
+We welcome pull requests from outside contributors. Pull requests
+must pass our CI and be approved by at least one code owner.
+Outside contributors should fully fill out the ROCm template (for
+non-trivial PRs).
+
+Please also ensure that your code complies with this project's
+coding style, as detailed in `STYLEGUIDE.md`.
+
 ## Issue Reporting
 
 * Non-security issues should be reported as GitHub issues
-* Security issues should be reported as directed in SECURITY.md
+* Security issues should be reported as directed in `SECURITY.md`
 * Feature requests should be made using GitHub discussions