Create README.md (#15)

README.md

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+# order-library
+[![Build Flow](https://github.com/HRV-Mart/order-library/actions/workflows/build.yml/badge.svg)](https://github.com/HRV-Mart/order-library/actions/workflows/build.yml)
+![GitHub Release Date - Published_At](https://img.shields.io/github/release-date/HRV-Mart/order-library)
+
+`order-library` package created for HRV-Mart to help Spring boot application to get data from order backend.
+## How to use
+1) Define dependency in `build.gradle` or `build.gradle.kts` or `pom.xml`
+   Use [this link](https://github.com/orgs/HRV-Mart/packages?repo_name=order-library) to pick appropriate version.
+2) Authenticate with GitHub Package. [link](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-gradle-registry#authenticating-with-a-personal-access-token)
+3) Build your project