Added release playbook for project deployment.

Signed-off-by: Leander Stephen D'Souza <leanderdsouza1234@gmail.com>

Author: leander-dsouza

release_playbook.md

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+# Release Playbook
+
+This playbook outlines the steps to release a new version of the `vcs2l` project. It includes tasks for updating version tags, generating changelogs, and publishing the release to GitHub.
+
+## 1. Release PR
+
+### Creation steps
+* Create the PR with the branch name - `github-username/release-x.y.z` where `x.y.z` is the new version number.
+* Update the version tag in [`vcs2l/__init__.py`](./vcs2l/__init__.py) file.
+* Update the [Changelog](CHANGELOG.rst) to include all the PRs merged since the last release. Also update the contributors involved in this release.
+* Make sure that this is done with the commit message as `x.y.z`.
+* Push the changes and create a PR against the `main` branch.
+
+### Merging steps
+* Make sure to rebase the PR if the `main` branch has moved ahead:
+   ```bash
+   git fetch origin main
+   git checkout github-username/release-x.y.z
+   git rebase origin/main
+   git push --force-with-lease origin github-username/release-x.y.z
+   ```
+
+* Upon approval, use the following commands to merge the PR:
+
+   ```bash
+   git checkout main
+   git merge --ff-only github-username/release-x.y.z
+   git push origin main
+   ```
+
+## 2. Tagging the release
+After merging the PR, create a new tag for the release using the following commands:
+
+```bash
+git checkout main
+git tag x.y.z
+git push origin x.y.z
+```
+
+## 3. Publishing the release on GitHub
+* Navigate to the [Releases](https://github.com/ros-infrastructure/vcs2l/releases/new) page, and select the tag you just pushed.
+* Fill in the release title as `x.y.z`.
+* Create the release notes by using the `Generate release notes` button.
+* Publish the release by setting it as the latest release.
+* This will automatically trigger the GitHub Actions workflow to publish the package to PyPI.