Update README.md

Author: abhinav-nath

README.md

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 All about Multi-threading and Concurrent programming in Java.
 Simple and easy to understand code examples for most of the Concurrent APIs provided by Java.
 
-⭐ Star this repository — it helps!
-
 ### Topics
 
 #### All about Threads
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   - [Need of CyclicBarrier](./src/com/codecafe/concurrency/cyclicbarrier/NeedOfCyclicBarrier.java)
 - [`atomic` variables](./src/com/codecafe/concurrency/_atomic)
 - [The `volatile` keyword](./notes/volatile-keyword.md) - [[code](./src/com/codecafe/concurrency/_volatile/VolatileDemo.java)]
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+---
+<p align="center">
+  ⭐ Star this repository — it helps!
+</p>