chore: Update README.md and add contribution guidelines

README.md

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 # Tailwind CSS Components
 
 Tailwind CSS Components on Product Hunt present pre-built UI elements crafted with the Tailwind CSS framework. They offer a range of ready-to-use design patterns, including buttons, cards, forms, and more, streamlining the process of web development.
+
+## Contributing
+
+We welcome contributions to enhance this project. Please ensure that any images you upload are hosted on the allowed domains to maintain security.
+
+To safeguard our visitors from potential security threats, all images must be uploaded via imgbb or Unsplash. The following domains are permitted:
+
+https://tailwind.besoeasy.com/
+https://cdn.tailwindcss.com
+https://unpkg.com
+https://i.ibb.co
+https://images.unsplash.com/
+
+For any issues or feature requests, feel free to open an issue on our GitHub repository.