docs: add Hacktoberfest documentation contribution guide

docs/Hacktoberfest_Guide.md

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+# Hacktoberfest Documentation Contribution Guide
+
+👋 Welcome contributors!  
+This repository focuses on **documentation-only** contributions.
+
+## ✅ What You Can Contribute
+- Fix typos or grammar in README files  
+- Add short explanations to existing documentation  
+- Improve formatting (headings, code blocks, etc.)  
+- Add contribution tips for beginners  
+
+## 🚀 How to Contribute
+1. Fork this repository  
+2. Create a new branch: `docs/update-readme`  
+3. Make your changes  
+4. Open a Pull Request with the title:  
+   **"docs: improve documentation clarity"**
+
+Thank you for contributing to open-source documentation!