Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to Contribute
+
+Two simple steps:
+
+* Fork this repository
+* Clone it to your machine
+
+Now you can start working on the project.
+
+## Here are things you could work on:
+
+1. New features, new functions, new stuff!
+    * Before adding anything new, please, first create an issue for it to be discussed;
+    * Write tests to anything new you make.
+2. Writing tests to try to reproduce those pesky bugs!
+    * Anything you might think that have not been tested yet.
+3. Writing the documentation.
+    * Don't write any documentation in the source files, only in `Documentation.md`.
+4. Writing cool examples.
+5. Writing benchmarks
+
+## But to do so you must:
+
+1. Maintain the code quality
+    * 4 space indentation;
+    * Preferably don't clump up the code, try to make it well spaced by using empty lines;
+    * Opening braces go underneath;
+    * Give some sense to the variable names.
+2. Maintain the structure of the project
+    * Separate files into folders when possible;
+    * Keep the `src` folder clean from anything that is not source code;
+    * Create a new folder for each example with a meaningful name if it has more than one file;
+3. If something looks complicated, explain it as well as possible