feat: add product hunt (#167)

README.md

@@ -7,6 +7,9 @@
 
 [Website](https://dify.ai) • [Docs](https://docs.dify.ai) • [Twitter](https://twitter.com/dify_ai) • [Discord](https://discord.gg/FngNHpbcY7)
 
+Vote for us on ProductHunt ↓  
+<img src="https://api.producthunt.com/widgets/embed-image/v1/featured.svg?post_id=dify-ai&amp;theme=light" alt="Product Hunt Badge" width="250" height="54">
+
 **Dify** is an easy-to-use LLMOps platform designed to empower more people to create sustainable, AI-native applications. With visual orchestration for various application types, Dify offers out-of-the-box, ready-to-use applications that can also serve as Backend-as-a-Service APIs. Unify your development process with one API for plugins and datasets integration, and streamline your operations using a single interface for prompt engineering, visual analytics, and continuous improvement.
 
 Applications created with Dify include: