Added Learn.md file

Learn.md

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+If you would like to contribute code to the project, please follow these steps:
+
+- Step 1: [Fork](https://github.com/DSC-JSS-NOIDA/blogzen) the repo first
+
+- Step 2: Go to your Git terminal and clone it on your machine.
+ ```
+ git clone https://github.com/<your_github_username>/UMatter.git
+ ```
+- Step 3: Add an upstream link to the main branch in your cloned repo
+ ```
+ git remote add upstream https://github.com/MonalikaPatnaik/UMatter.git
+ ```
+- Step 4: Keep your cloned repository up to date by pulling from upstream. This will help you avoid merge conflicts while committing new changes.
+ ```
+ git pull upstream main
+ ```
+- Step 5: Create your feature branch (This is a necessary step, so don't skip it)
+ ```
+ git checkout -b <feature-name>
+ ```
+- Step 6: Track and stage your changes.
+
+ ```
+ # Track the changes
+ git status
+
+ # Add changes to Index
+ git add . or git add <file_name>
+ ```
+
+- Step 7: Commit your changes (Write commit message as "Small Message")
+ ```
+ git commit -m "Write a meaningful but small commit message"
+ ```
+- Step 8: Push the changes for review
+ ```
+ git push -u origin <branch-name>
+ ```
+- Step 9: Create a pull request on GitHub. (Don't just hit the create a pull request button; you must write a PR message to clarify why and what you are contributing).