Readme added

.github/workflows/reusable/Readme.md

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+## Reusable workflows
+The reusable workflows serves as a template for new repositories in the Polygon organization.
+
+## Usage
+
+Workflows:
+- docker_build_deploy: If docker file is to be required to be passed and is not the default Dockerfile from root of calling repository.
+
+- npm_build_deploy_default: If default Dockerfile from root is used and npm build and test are required before building the image on docker.