add pre-commit installation and running ar CONTRIBUTING.MD

CONTRIBUTING.md

@@ -4,16 +4,30 @@ Thank you for considering contributing to htmldate!
 
 Here are some important resources:
 
-  * [List of currently open issues](https://github.com/adbar/htmldate/issues) (no pretention to exhaustivity!)
-  * [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
+- [List of currently open issues](https://github.com/adbar/htmldate/issues) (no pretention to exhaustivity!)
+- [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
 
 There are many ways to contribute, you could:
 
-  * Improve the documentation
-  * Find bugs and submit bug reports
-  * Submit feature requests
-  * Write tutorials or blog posts
-  * Write code
+- Improve the documentation
+- Find bugs and submit bug reports
+- Submit feature requests
+- Write tutorials or blog posts
+- Write code
+
+## Installing and Running Pre-commit
+
+### Introduction
+
+Pre-commit is a tool that helps maintain a consistent code style and quality in our project by running a set of hooks before each commit. These hooks perform checks such as code formatting, linting, and ensuring compliance with project-specific guidelines.
+
+### Installation and Running
+
+To install and set up pre-commit in your development environment, follow these steps:
+
+1. **Install Pre-commit**: Run `pip install pre-commit` to your terminal to install pre-commit using pip.
+2. **Install the git hook scripts**: Once pre-commit is installed, navigate to your project directory and run `pre-commit install`to initialize pre-commit hooks.
+3. **(optional) Run against all the files**: After pre-commit is installed and initialized, you can run it manually on your changes using `pre-commit run --all-files`
 
 ## Submitting changes
 
@@ -23,7 +37,6 @@ Please send a [GitHub Pull Request to htmldate](https://github.com/adbar/htmldat
 
 For further questions you can contact me on [GitHub issues](), [Twitter](https://twitter.com/adbarbaresi) or by [E-Mail](http://adrien.barbaresi.eu/contact.html)
 
-
 Thanks,
 
-Adrien
+Adrien