Created CONTRIBUTING.md (#207)

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 maven 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:
+
+```shell script
+./mvnw clean install
+```
+
+This will run all the steps defined in the `pom.xml` 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.
+
+This project uses [semantic versioning](https://semver.org/) and does NOT prefix tags or release titles with `v` i.e. use `1.2.3` instead of `v1.2.3`