Added a useful site for amazing hackathon

Author: kkkkkabir

README.md

@@ -115,6 +115,7 @@ Useful articles and learning resources.
 - [Free Code Camp](https://www.freecodecamp.org) - Software development related posts
 - [CSS Tricks](https://css-tricks.com) - CSS related posts
 - [DEV.to](https://dev.to) - The All in One Blogs Portal for Developers
+- [Devpost](https://devpost.com/) - A great place for hackathons
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