Additional Resources: add a resource to learn git

[zondiMaqina]

Because

I just added an extra resource for git's intermediate first topic to help others learn more of git in a fun way (i also did this as a project for "using git on the real world")

This PR

• Add resource (link to a git game) for learning more of git.

Issue

Closes #XXXXX

Additional Information

Pull Request Requirements

• [x ] I have thoroughly read and understand The Odin Project curriculum contributing guide
• [x ] The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• [x ] The Because section summarizes the reason for this PR
• [x ] The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[zondiMaqina]

Happy for this opportunity thank you