Create Nano_Emacs_Tutorial.md

[tguilloryiii]

The initial tutorial file.

[rougier]

Thanks ! Here are some comments:

• It is mode an installation procedure on Windows rather than a tutorial, no?
• The use of literate configuration through org-mode might be a bit difficult to grasp for new users don't you think?
• You have a section on using it under OSX but you start by giving Windows path

[tguilloryiii]

No problem! You made some good points. I'll make those changes when I can.