Merge branch 'collaboration/05-git-pull-request'

Author: Amin Jafari

git-pull-request.md

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+# Git Pull Request
+
+A pull request (PR) is a way to propose changes to a repository.
+
+## Usage
+1. Fork the repository.
+2. Create a new branch and make changes.
+3. Push the branch to your fork.
+4. Open a PR on GitHub/GitLab.
+
+## Explanation
+- PRs allow collaborators to review and discuss changes before merging.
+- Resolve conflicts and address feedback during the PR process.
+
+## Example
+```bash
+git checkout -b feature-login
+git add .
+git commit -m "Add login feature"
+git push origin feature-login
+```