Addition of Link for the Postman Collection

Author: harsh159357

README.md

@@ -44,6 +44,8 @@
 
 **Its Android CounterPart [Click Here](https://github.com/harsh159357/android_client_php_backend)**
 
+**If you are aware of [Postman](https://www.getpostman.com/) you can use [Postman Collection](https://www.getpostman.com/collections/80394d2fc7c2aed05cc5) for Rest API used in this repo**
+
 License
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