Added first draft

docs/Contributing.md

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+# Contributing
+
+You want to improve this project? Awesome! But before you wirte or modify the existing source code, please note the following guideline:
+
+- Always make sure to add your changes to the wiki.
+- 8-space indentation without tabs.
+- Docstrings as this:
+```python
+    """ This is single line docstring. """
+    """ This is a
+    """ multiline comment.
+```
+- Wrap lines only if really long (it does not matter 79 chars PEP8)
+- For the rest a bit as it comes :)