Add Stargazer Bar

[jazzyalex]

Adds Stargazer Bar to the System Tools / Menu Bar section.

Mark the following tasks as done:

• Checked repositories.yaml to ensure that your repository is not already listed.
• Checked the pull requests to ensure that another person has not already submitted the same repository.
• Take note of the contributing guidelines.
• Modified only the repositories.yaml file (README.md is automatically generated).
• Repository being added is actively maintained (recent commits).
• Repository being added has an open source license.

Thanks for contributing!