Enhance CONTRIBUTING.md with pre-commit instructions

CONTRIBUTING.md

@@ -43,3 +43,113 @@ Update [CHANGELOG.md](CHANGELOG.md) to mint a new release from `main`,
 then `git tag` with [CalVer](https://calver.org/) (format `YYYY.MM.MINOR`).
 
 Then invoke C4 to deploy on the server in itself.
+
+## 🚀 Contributing Guide – Pre-commit Setup
+
+To keep the codebase clean and maintain high-quality standards, this project uses **pre-commit hooks**.  
+These hooks automatically check your code before it is committed, ensuring it follows formatting, linting, and style rules.
+
+---
+
+## ❓ Why Do We Use Pre-commit?
+
+Pre-commit helps to:
+
+- ✅ Maintain consistent code style across all contributions  
+- ✅ Automatically fix formatting and linting issues  
+- ✅ Reduce CI failures caused by code quality checks  
+- ✅ Save reviewer time by catching errors early  
+- ✅ Make sure your first PR does not get blocked by CI linting  
+
+Without pre-commit, your Pull Request might fail automated checks, and you will need to fix and push changes again.
+
+---
+
+## ⚙️ Installing Pre-commit
+
+Follow these steps before making your first contribution.
+
+### 1️⃣ Install Pre-commit
+
+Make sure you have Python installed, then run:
+
+
+`pip install pre-commit`
+
+
+### 2️⃣ Install Project Hooks
+
+After cloning the repository, run:
+
+`pre-commit install` 
+
+This command installs the hooks locally so they run automatically before each commit.
+
+----------
+
+### 3️⃣ Run Pre-commit Manually (Optional but Recommended)
+
+You can test everything before committing:
+
+`pre-commit run --all-files` 
+
+This will check and fix issues across the project.
+
+----------
+
+## 🔄 Workflow with Pre-commit
+
+Your contribution workflow should look like this:
+
+1.  Fork the repository
+
+2.  Clone your fork locally
+
+3.  Install pre-commit hooks
+
+4.  Make your changes
+
+5.  Commit normally
+
+6.  Push and create a Pull Request
+
+
+If pre-commit finds issues, it will automatically fix them or show errors that must be corrected before committing.
+
+----------
+
+## 🛠️ Fixing Pre-commit Errors
+
+If pre-commit blocks your commit:
+
+### Step 1: Review Errors
+
+Check the errors shown in your terminal.
+
+### Step 2: Fix or Stage Auto-fixed Files
+
+`git add .` 
+
+### Step 3: Commit Again
+
+`git commit -m "Fix linting issues"` 
+
+----------
+
+## 📚 Contribution Resources
+
+Please also check our full contribution guidelines:
+
+👉 [https://github.com/UrLab/DocHub#contribute-](https://github.com/UrLab/DocHub#contribute-)
+
+----------
+
+## 💡 Tips for New Contributors
+
+-   Always run pre-commit before pushing code
+
+-   Keep commits small and focused
+
+-   Read CI error messages carefully if your PR fails
+
+-   Do not hesitate to ask maintainers for help