Update README.md

README.md

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-# counter-service
-GitHub Actions, Docker and AWS services (ECR, EC2)
+# A basic counter-service using
+GitHub Actions, Docker, AWS services (ECR, EC2), Flask
+
+1. This app keeps track of a counter, which is displayed for a GET request to the app and is increased by 1 for a POST request. The application is written in python with the flask framework. 
+2. Then the application is containerised using docker to make it portable. A Dockerfile is written for the same. 
+3. And finally a github action workflow is written to build the docker image and push it to Amazon ECR