Introduction to Git: Additional Resources.md

[MysticElven]

A brief introduction to what GitHub is and how Git and GitHub work together, for those who prefer video.

Because

This PR adds a video resource that introduces Git and GitHub and how they work together. It caters to learners who prefer video content.

This PR

• Added a new video link to the Additional Resources section of the relevant lesson.
• The video provides an overview of GitHub's purpose and its integration with Git, helping beginners understand the concepts visually.

Issue

Closes #29467

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• 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
• The Because section summarizes the reason for this PR
• 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