Added a workflow status badge

README.md

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+[![.NET](https://github.com/ankushjain358/serverless-dotnet-apis-with-amazon-cognito/actions/workflows/dotnet.yml/badge.svg)](https://github.com/ankushjain358/serverless-dotnet-apis-with-amazon-cognito/actions/workflows/dotnet.yml)
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 # Serverless .NET APIs using AWS Lambda, Amazon API Gateway and Amazon Cognito
 
 This repository provides you code samples along with the guidance how you can build serverless .NET APIs on AWS and secure them with Amazon Cognito.
@@ -77,4 +79,4 @@ https://<random-text>.execute-api.<region>.amazonaws.com/<stage-name>/
 2. Import the `collections` and `environment variables` in ThunderClient from `thunder-client` folder.
 3. Update the environment variable values with their actual values.
 4. Save everything.
-5. You're good to go!
+5. You're good to go!