added facebook ai blog

Author: DFRICHARD

README.md

@@ -121,6 +121,7 @@ Useful articles and learning resources.
 - [Hashnode](https://hashnode.com/) - A one-stop platform to start blogging as a developer.
 - [Codepen Blog](https://blog.codepen.io/) - A blog about the ins and outs of running a web software business.
 - [Airbnb Engineering Blog](https://airbnb.io/) - A blog about Airbnb's Engineering and Data Science Structure
+- [Facebook AI Blog](https://ai.facebook.com/blog) - A blog on researches and open source projects at Facebook AI.
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