Add contributing guidelines for automation scripts

Author: DiogoRibeiro7

CONTRIBUTING.md

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+# Contributing
+
+This project uses several helper scripts to keep the Markdown posts and front matter consistent. These scripts can modify many files across the repository.
+
+Because these updates are often large-scale, test them on a separate branch before merging.
+
+## Running automation scripts
+
+1. Start from an up-to-date branch and create a new working branch:
+
+   ```bash
+   git checkout master
+   git pull
+   git checkout -b automation-update
+   ```
+
+2. Run the automation scripts:
+
+   ```bash
+   ./run_scripts.sh
+   ```
+
+   The scripts may rename files and update front matter, leading to many modified files.
+
+3. Review the changes:
+
+   ```bash
+   git status
+   git diff
+   ```
+
+   Look carefully over the diff before committing because the updates can be large.
+
+4. Commit the desired changes and open a pull request.
+
+Running the scripts on a clean branch helps keep your history tidy and makes code review easier.