Added Run in Postman

Author: CodeWithPraveen

README.md

@@ -7,6 +7,9 @@ This repo covers the following:
 * Assignment (ready-made projects to start working)
 * Assignment Solutions
 
+## Check out this OpenAPI Specification in Postman
+[![Run in Postman](https://run.pstmn.io/button.svg)](https://app.getpostman.com/run-collection/2568495-87ad0d63-c03a-49a0-93e3-f8d87232baeb?action=collection%2Ffork&collection-url=entityId%3D2568495-87ad0d63-c03a-49a0-93e3-f8d87232baeb%26entityType%3Dcollection%26workspaceId%3D97b24bb2-627b-488c-9796-954a8b3aa914)
+
 ## Enroll in this course with 90% discount
 Click this link to enroll in this course:
 https://codewithpraveen.com/openapi-course