docs: documenting the release process (#248)

Author: sandeepvinayak

RELEASE.md

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+# Release Process
+
+MultiCloudJ uses [Release Please](https://github.com/googleapis/release-please) for automated release management.
+
+## How It Works
+
+1. **Development**: Commit changes to feature branches using [Conventional Commits](https://www.conventionalcommits.org/) format:
+   - `feat:` - New features
+   - `fix:` - Bug fixes
+   - `perf:` - Performance improvements
+   - `blobstore:` - Blob Store changes
+   - `docstore:` - Document Store changes
+   - `sts:` - STS changes
+   - `pubsub:` - PubSub changes
+   - `iam:` - IAM changes
+   - `refactor:` - Code refactoring
+   - `docs:` - Documentation updates
+   - `test:` - Test updates
+   - `chore:` - Maintenance tasks
+
+2. **Merge to Main**: When PRs are merged to the `main` branch, Release Please automatically:
+   - Analyzes commit messages
+   - Creates/updates a release PR with:
+     - Updated version in `pom.xml`
+     - Generated `CHANGELOG.md` entries
+     - Release notes
+   - ![#f03c15](https://placehold.co/15x15/f03c15/f03c15.png) Release PRs are of this format: `chore(main): release multicloudj <version>`
+   - ![#f03c15](https://placehold.co/15x15/f03c15/f03c15.png) IMPORTANT: the release PR is updated on every merge to main, merge ONLY when ready to release. Example of the release PR https://github.com/salesforce/multicloudj/pull/218
+
+3. **Create Release**: When the release PR is merged:
+   - Maintainers get the notification to approve the release on email. Once approved:
+   - Release Please create a GitHub release and tag. Example: https://github.com/salesforce/multicloudj/releases/tag/multicloudj-v0.2.22
+   - [CHANGELOG](https://github.com/salesforce/multicloudj/blob/main/CHANGELOG.md) is updated.
+   - GitHub Actions workflow automatically:
+     - Builds the project (`mvn clean verify`)
+     - Runs all tests
+     - Deploys artifacts to Maven Central using the `release` profile
+     - Signs artifacts with GPG
+   - Creates the PR for the snapshot version bump with title `chore(main): release multicloudj <version++>-SNAPSHOT` . For example: https://github.com/salesforce/multicloudj/pull/229
+   
+## Manual Steps
+
+![#f03c15](https://placehold.co/15x15/f03c15/f03c15.png) No manual steps are required. The entire release process is automated through GitHub Actions.
+
+## Important:
+- ![#f03c15](https://placehold.co/15x15/f03c15/f03c15.png) Do not create any tags manually, it breaks the state of release-please
+- ![#f03c15](https://placehold.co/15x15/f03c15/f03c15.png) Do not merge any PR's between the release and the snapshot update PR's by release-please.
+
+
+