Added License Badge

Author: vinitjames

README.md

@@ -3,7 +3,7 @@ CircularBuffer
 
 [![Actions Status](https://github.com/vinitjames/circularbuffer_CPP/workflows/Build%20and%20Test/badge.svg)](https://github.com/vinitjames/circularbuffer_CPP/actions)
 
-
+[![MIT License](https://img.shields.io/github/license/vinitjames/circularbuffer)](https://github.com/vinitjames/circularbuffer/blob/master/LICENSE)
 ## About
 circularbuffer_CPP is a simple, general purpose STL style [circularbuffer](https://en.wikipedia.org/wiki/Circular_buffer) implementation in C++.