Empty file for windows docs.
Some beginning collection for Windows users.

Leaving the office so it's a bit unkempt.
Add additional information about encoding issues on Windows
Add note about auto-regeneration
Add block of code which should be added to Gemfile for Windows listen compatibility.

Closes https://github.com/mojombo/jekyll/pull/1720
Use Markdown, silly
Merge pull request #1818 from jekyll/windows-docs
Update history to reflect merge of #1818