Add a contributing file

Author: sjoelund

.gitignore

@@ -15,4 +15,5 @@ install-sh
 .openmodelica.aspell
 OMPython/
 OpenModelicaSetup/
-NewDocumentation/
+NewDocumentation/
+.settings

CONTRIBUTING.md

@@ -0,0 +1,39 @@
+# How to contribute to the OpenModelica Compiler
+
+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).
+
+Contributions are primarily in the form of pull requests.
+To learn more about [collaboration, see the github articles](https://help.github.com/categories/collaborating/).
+Fork the OpenModelica repositories into your user account, create a
+topic branch (not master) which you make your changes in and push to
+your own fork. The reason for the topic branch is to isolate your changes.
+If you want to fix two different things, create two different branches
+to make the changes easier to review.
+
+Note that [@OpenModelica-Hudson](https://github.com/OpenModelica-Hudson/)
+will rebase your changes on top of master, which means that if you create
+new commits on top of your topic branch, your changes might be hard to
+merge with the master.
+
+Commits that are pushed to this repository should pass the [test suite](https://github.com/OpenModelica/OpenModelica-testsuite),
+and [@OpenModelica-Hudson](https://github.com/OpenModelica-Hudson/) makes sure this is true.
+
+Developers can trigger the Hudson job [OpenModelica hudson job](https://test.openmodelica.org/hudson/job/OpenModelica_TEST_PULL_REQUEST/build?delay=0sec)
+after creating a pull request to trigger a build+test+push from a pull
+request (or directly from the developer's own branch). The Hudson job
+refuses to build any hash other than the latest hash in the pull request,
+which automatically syncs to the fork. It is thus important that if the
+pull request is finished, no more commits are pushed unless they fix
+something.
+
+All commits should adhere to the following simple guidelines (the Hudson
+job checks some of these restrictions, and will automatically reject your
+submission if the reviewer missed it):
+
+* Use UTF-8 as file encoding.
+* No trailing whitespace in text-files.
+* No binary files added (object files, etc). Images are fine for icons in the graphical clients. Note that images should use vector graphics (SVG) as far as it is possible to do so.
+* No automatically generated code added. This includes documentation such as Doxygen.
+* No adding+deleting the same file or line (debug lines/etc). Do an interactive rebase to squash the commits into one.
+* If you have many added+deleted files/etc - squash all commits into a single commit instead.
+* For OpenModelica-testsuite: Any added or modified reference file needs to use [filterSimulationResults](https://openmodelica.org/doc/OpenModelicaUsersGuide/latest/scripting_api.html#filtersimulationresults) to create a file with a minimal number of trajectories and output points in order to reduce the file size.

README.md

@@ -51,7 +51,7 @@ In order to push to the repository, you will push to your own fork of OMCompiler
 
 ### How to contribute to the OpenModelica Compiler
 
-See [OMCompiler.git](https://github.com/OpenModelica/OMCompiler/blob/master/README.md#how-to-contribute-to-the-openmodelica-compiler).
+See [CONTRIBUTING.md](https://github.com/OpenModelica/OpenModelica/blob/master/CONTRIBUTING.md).
 
 ### To checkout a minimal version of OpenModelica
 ```bash