Git Fundamentals: Add, Commit, Status, Diff

# Introduction

<div class="alert alert-warning" role="alert">
<p>🧑‍💻 New to Git or LabEx? We recommend starting with the <b><a style="color: unset;text-decoration: underline;" href="https://labex.io/courses/quick-start-with-git" target="_blank">Quick Start with Git</a></b> course.</p>
</div>

This challenge will test your knowledge of basic Git commands, specifically `git add`, `git commit`, `git status`, and `git diff`. These commands are essential for version control and managing changes to your Git repository.

## Achievements

- `git add`: This command adds changes to the staging area, preparing them to be committed.
- `git commit`: This command saves changes to the repository, creating a new commit with a unique ID.
- `git status`: This command shows the current status of the repository, including which changes are staged and which are not.
- `git diff`: This command shows the differences between two states of a file or between two different files.