Add a CONTRIBUTING file

CONTRIBUTING.md

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+# How to contribute to the OpenModelica Compiler
+
+See [OpenModelica.git](https://github.com/OpenModelica/OpenModelica/blob/master/CONTRIBUTING.md).

README.md

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 # OMCompiler
 The OpenModelica Compiler is the core of the OpenModelica project, which is an open-source Modelica-based modeling and simulation environment intended for industrial and academic usage.
 
-## How to contribute to the OpenModelica Compiler
-
-Contributions are primarily in the form of [pull requests](https://github.com/OpenModelica/OMCompiler/pulls).
-Note that your contributions are assumed to follow the [contributor license agreement](https://openmodelica.org/osmc-pl/osmc-pl-1.2.txt) (which means the [Open Source Modelica Consortium](https://openmodelica.org) holds the copyright).
-
-Commits that are pushed to this repository should pass the [test suite](https://github.com/OpenModelica/OpenModelica-testsuite), and @OpenModelica-Hudson makes sure this is true.
-Developers should push their changes elsewhere and use the [OpenModelica hudson job](https://test.openmodelica.org/hudson/job/OpenModelica_TEST_PULL_REQUEST/build?delay=0sec) to trigger a build+push (it can build from a given URL+branch or a specific pull request, as desired).
-It is recommended to use a feature branch for pull requests since hudson may rebase them, which in turn would make it harder to merge the changes.
-
 ## Building the OpenModelica Compiler
 
 There are [Linux instructions](README.Linux.md) available.