docs(Git project): Add subject file

subjects/git/README.md

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+# Git Ready
+## Introduction
+The Git project is designed to introduce you to the world of version control and collaboration with Git. 
+Git is a powerful and widely used tool for tracking changes in your projects, collaborating with others, 
+and ensuring the integrity of your code.
+
+To aid your learning journey, we provide you with a resource called "git-ready.zip," which you can find in the "resources" folder.
+
+This Git project is structured as a series of exercises. You will progressively build your Git skills,
+starting from the basics and gradually moving towards more advanced topics.
+
+Let's Git ready for it! 
+
+#### Setting Up Git and Python for Work
+- Install Git on your local machine by following the instructions for your operating system on the official Git website.
+- Configure Git with your name and email address.
+
+#### Git commits to commit
+- In `work` directory, create a folder named `hello` then a file `hello.rb` with the content below:
+  ```
+  puts "Hello, World"
+  ```
+- Initialize the git repository in `hello` directory, then add `hello.rb` to the repository.
+- Check the status and act accordingly with the output of the executed command.
+- Change the “Hello, World” program. Change the file to be
+```
+puts "Hello, #{ARGV.first}!"
+```
+- Stage the changed file and commit the changes, the working tree should be clean.
+- Change again `hello.rb` file and add the file to staging area, make two commits one for the comment in line1, the other for lines 3 and 4.
+```
+# Default is "World"
+name = ARGV.first || "World"
+
+puts "Hello, #{name}!"
+```
+
+#### History
+- Show the history of the working directory.
+- Show One line history; only the hashes and commit messages are displayed.
+- Show logs with control over entries displayed: 2 last entries, since 5 minutes ago, until 5 minutes ago.
+- Show logs in a personalized format like: `* e4e3645 2023-06-10 | Added a comment (HEAD -> main) [John Doe]`
+
+#### Gitting old versions
+
+