feature/MIG-6533 Add RELEASING.md documentation

RELEASING.md

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+## Releasing and Publishing
+
+You can find the published package here: [@mongodb-js/diagramming](https://www.npmjs.com/package/@mongodb-js/diagramming)
+
+Follow these steps to publish a new release:
+
+### 1. Navigate to GitHub Releases
+Go to the **Releases** tab in the sidebar of the main repository page.
+
+### 2. Decide on the Version
+
+Choose the version number based on [Semantic Versioning](https://semver.org/):
+
+- `MAJOR.MINOR.PATCH` (e.g., `1.2.3`) 
+- **Patch** – For bug fixes or security updates.
+- **Minor** – For new features that are backwards compatible.
+- **Major** – For breaking changes or significant redesigns.
+- **Pre-releases** – For early/in-progress versions, use a suffix like `-alpha.1`, `-beta.2`, or `-rc.1` (e.g., `1.0.0-beta.1`).
+
+### 3. Create the Release
+1. Click **"Draft a new release"**. 
+2. Create a **new Git tag** with your selected version (e.g., `1.2.3`) — **Do not prefix with `v`.**
+3. Point the release to the branch you're publishing from (typically `main`).
+4. **Generate release notes** based on commit history.
+
+### 4. Monitor the GitHub Workflow
+
+After creating the release:
+
+1. Go to the **Actions** tab. 
+2. Look for the workflow triggered by the new release. 
+3. This workflow handles building the package and **publishing it to npm**.