Adding CONTRIBUTING.md with 'New Version Release Procedure'.

CONTRIBUTING.md

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+# Contributing
+
+For general contributions, please open an issue on GitHub using one of the below templates:
+- [Bug Report](https://github.com/ChrisCarini/intellij-platform-plugin-verifier-action/issues/new?assignees=&labels=&template=bug_report.md&title=)
+- [Feature Request](https://github.com/ChrisCarini/intellij-platform-plugin-verifier-action/issues/new?assignees=&labels=&template=feature_request.md&title=)
+
+
+## New Version Release Procedure
+
+1. Navigate to
+   the [GitHub Releases page for ChrisCarini/intellij-platform-plugin-verifier-action](https://github.com/ChrisCarini/intellij-platform-plugin-verifier-action/releases)
+2. Click `Draft a new release`
+3. Enter the below information
+    1. Ensure `Publish this Action to the GitHub Marketplace` is selected
+    2. **version tag:** we follow the format `v<version>` (ie, `v1.0.1`)
+    3. **target:** Likely targeting the `master` branch, but possible a different commit.
+    4. **release title:** `Release v<version>` (ie, `Release v1.0.1`)
+    5. **description:**
+   ```markdown
+   <SHORT_DESCRIPTION_ONE_OR_TWO_SENTENCES> 
+
+   ### Added
+
+   1. N/A
+
+   ### Upgrade
+
+   1. N/A
+
+   ### Fixed
+
+   1. N/A
+   ```
+   (**Note:** Update the `Added`, `Upgrade`, and `Fixed` sections as needed, linking to GitHub PRs/Issues when
+   appropriate.)
+4. Click `Publish Release`
+5. Update the `latest` tag to the most current release:
+   ```shell
+   git tag -d latest && git push origin :refs/tags/latest && git tag latest master && git push origin latest
+   ```