Create CONTRIBUTING.md

CONTRIBUTING.md

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+### You're welcome to join the development of JLibra
+
+## Have a new feature in mind?
+Create an Issue about it and describe the feature you have in mind. 
+
+## Want to work on an existing issue?
+Claim the issue and add a description about how you're planning to solve it.
+
+## Before writing code
+Set up the code conventions in your IDE
+(If your IDE does not supprort these settings, don't let that hold you, just try to make the code similar to the existing)
+
+### Eclipse
+**Code format:** Window -> Preferences -> Java > Code Style > Formatter - Import the file `jlibra-eclipse-code-format.xml` from the project root
+
+**Import ordering:** Window -> Preferences -> Java > Code Style > Organize Imports - Import the file `jlibra-eclipse.importorder` from the project root
+
+After this you can also enable 'Format source code' and 'Organize Imports' from the Save Actions (Java > Editor > Save Actions)
+
+### IntelliJ
+TODO