Merge pull request #43 from ContextMapper/update-readme

add contributing & licence information

Author: lstreckeisen

README.md

@@ -44,3 +44,12 @@ Use the following command to build and run the plugin:
 ```bash
 ./gradlew runIde
 ```
+
+## Contributing
+Contribution is always welcome! Here are some ways how you can contribute:
+* Create Github issues if you find bugs or just want to give suggestions for improvements.
+* This is an open source project: if you want to code, [create pull requests](https://help.github.com/articles/creating-a-pull-request/) from [forks of this repository](https://help.github.com/articles/fork-a-repo/). Please refer to a Github issue if you contribute this way.
+* If you want to contribute to our documentation and user guides on our website [https://contextmapper.org/](https://contextmapper.org/), create pull requests from forks of the corresponding page repo [https://github.com/ContextMapper/contextmapper.github.io](https://github.com/ContextMapper/contextmapper.github.io) or create issues [there](https://github.com/ContextMapper/contextmapper.github.io/issues).
+
+## Licence
+ContextMapper is released under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0).