Create CONTRIBUTING.md

CONTRIBUTING.md

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+All patches are welcome. If you're ading a new example, please do create an issue before submitting a patch.
+
+You can use the following template for adding a new example:
+
+```
+  ### Some fancy Title
+
+  ```py
+  # Setting up the code.
+  # Preparation for the magic...
+  ```
+
+  **Output (Python version):**
+  ```py
+  >>> triggering_statement
+  Probably unexpected output
+  ```
+  (Optional): One line describing the unexpected output.
+
+  **Note:** All the examples mentioned below are run on Python 3.5.2 interactive interpreter unless explicitly specified.
+
+
+  #### 💡 Explanation:
+  * Brief explanation of what's happening and why is it happening.
+    ```py
+    Setting up examples for clarification (if necessary)
+    ```
+    **Outupt:**
+    ```py
+    >>> trigger # some example that makes it easy to unveil the magic
+    # some justified output
+    ```
+```