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+### **How to contribute?** 
+
+* Open a pull request explaining your addition/fix.If it is an addition of a class or an algorithm please explain why it's useful and provide a url to a wikipedia page for the algorithm/data structure you're suggesting.
+
+* Implementation is not everyting, you have to provide test cases in the **tests** folder for **EVERY** function you implement.
+
+* Last but not least, you have to write some documentation in the **tutorial** folder for the users to know how to use your code. 
+
+We are happy to see you contribute :).  
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