Added in CONTRIBUTING.md file

CONTRIBUTING.md

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+# Contributing
+This project is open to accept feature requests and contributions from the open source community.
+Please fork the repo and start a new branch to work on.
+
+
+## Building locally
+This project is using [Gradle](https://gradle.org/) for its build tool.
+A Gradle Wrapper is included in the code though, so you do not have to manage your own installation.
+
+To run a build simply exucute the following:
+
+``` bash
+./gradlew clean build
+```
+
+This will run all the steps defined in the `build.gradle.kts` file.
+
+
+## Testing
+If you are adding a new feature or bug fix please ensure there is proper test coverage.
+
+## Pull Request Review
+If you have a branch on your fork that is ready to be merged, please create a new pull request. The maintainers will review to make sure the above guidelines have been followed and if the changes are helpful to all library users, they will be merged.