Update README

README.md

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-# Todo app
+# Todo sample app
+This is a sample .NETCore app that illustrates application CI/CD strategies. It provides a simple REST API to create and retrieve TODO items from a DynamoDB database.
+
+## Requirements
+- .NET 7
+
+## Contributing guidelines
+- Create a branch from the latest `main` commit
+- Work on your changes and routinely commit them to the remote
+- Keep your branch updated with `main`
+- Cover your updates with a decent tests as pull requests that reduce coverage will not pass review.
+- When ready open a pull request