Update README.md

Author: amitshekhariitbhu

README.md

@@ -44,6 +44,15 @@ You can connect with me on:
 - [LinkedIn](https://www.linkedin.com/in/amit-shekhar-iitbhu)
 - [GitHub](https://github.com/amitshekhariitbhu)
 
+## System Design Playlist on YouTube
+
+- [What is System Design?](https://www.youtube.com/watch?v=i4YWRY3hsdA)
+- [Twitter Timeline Design with Fanout Approach - System Design](https://www.youtube.com/watch?v=_7qHGfwgPz0)
+- [HTTP Request vs HTTP Long-Polling vs WebSocket vs Server-Sent Events](https://www.youtube.com/watch?v=8ksWRX4xV-s)
+- [YouTube Video Upload Service - System Design](https://www.youtube.com/watch?v=N0vvJTkokZc)
+- [What is Consistent Hashing?](https://www.youtube.com/watch?v=dV5cIm9T3ss)
+- [Capacity Estimation: Back-of-the-envelope calculation - Twitter](https://www.youtube.com/watch?v=yrbKxzXm6_Q)
+
 ## Major Packages used in this project
 
 - **gin**: Gin is an HTTP web framework written in Go (Golang). It features a Martini-like API with much better performance -- up to 40 times faster. If you need a smashing performance, get yourself some Gin.