Create CONTRIBUTING.md

CONTRIBUTING.md

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+#How to contribute
+
+If you want to contribute you can follow these setps:
+- Fist create your own clone of assimp
+- When you want to fix a bug or add a new feature create a branch on your own fork ( just follow https://help.github.com/articles/creating-a-pull-request-from-a-fork/ )
+- Push it to the repo and open a pull request
+- A pull request will start our CI-service, which checks if the build works for linux and windows. 
+  It will check for memory leaks, compiler warnings and memory alignment issues. If any of these tests fails: fix it and the tests will be reastarted automatically
+  - At the end we will perform a code review and merge your branch to the master branch.
+  
+