Create CONTRIBUTING.md

Author: Phantsure

CONTRIBUTING.md

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+## Contribution
+ * Contributions are always welcome. Language doesn't matter. Just make sure you're implementing an algorithm.
+ * PRs are welcome. To begin developing, follow the structure:
+
+  > algorithm_name/language-name/file_name.extension
+ e.g
+  > bubble_sort/python/bubble_sort.py
+
+ * If there is an implementation of the same algorithm in your language, add your username in front of the file name.
+ * Please include a description for the algorithm that you are implementing. It doesn't matter if it's copied from somewhere as long as it helps people that are learning new algorithm.
+ * Graphical examples would be very helpful too.
+ * Don't forget to include tests.
+ * Don't remove previous implementations of algorithms. Just add a new file with your own implementation.
+ * Beautify and cleanup your code for easier reading.