chore: add CONTRIBUTING.md

Author: odhyp

CONTRIBUTING.md

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+# Contributing to Awesome Portfolio  
+
+Thanks for your interest in contributing! This project is a curated collection of portfolio websites, allowing users to explore portfolios by tech stack.  
+
+
+
+## 📜 Contribution Guidelines  
+
+- Your portfolio **must be publicly accessible**.  
+- Only submit **personal portfolio websites** (not client work or agencies).  
+- Follow the submission format carefully to ensure consistency.  
+- Ensure your portfolio is **functional and visually complete** before submission.  
+
+
+
+## 🚀 How to Submit Your Portfolio  
+
+Follow the step-by-step guide on our website:  
+
+👉 **[Contribution Guide](https://awesome-porto.vercel.app/guide)**  
+
+
+
+## 💡 Best Practices  
+
+✅ **Keep it clean** – Ensure your portfolio is well-structured.  
+✅ **Optimize performance** – Avoid slow load times and broken links.  
+✅ **Showcase work** – A strong portfolio includes projects, case studies, or blog posts.  
+
+
+
+Happy contributing! 🎨