README.md: Copy the docstring into a README

And add Markdown links for all the packages we reference.  This gives
folks hitting the repository a more traditional welcome.

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+Software Carpentry Windows Installer
+
+Helps mimic a *nix environment on Windows with as little work as possible.
+
+The script:
+
+* Installs [nano][] and makes it accessible from [msysGit][]
+* Installs [SQLite][] and makes it accessible from msysGit
+* Creates a `~/nano.rc` with links to syntax highlighting configs
+* Provides standard [nosetests][] behavior for msysGit
+* Add [R][]'s bin directory to the path (if we can find it)
+
+To use:
+
+1. Install [Python][], [IPython][], and [Nose][nose].  An easy way to
+   do this is with the [Anaconda CE][Anaconda-CE] Python distribution.
+2. [Install msysGit][msysgit-install]
+3. Run `swc-windows-installer.py`.  You should be able to simply
+   double click the file in Windows.
+
+[msysGit]: http://msysgit.github.io/
+[msysgit-install]: https://github.com/msysgit/msysgit/releases
+[nano]: http://www.nano-editor.org/
+[SQLite]: http://www.sqlite.org/
+[Python]: https://www.python.org/
+[IPython]: http://ipython.org/
+[Nose]: https://nose.readthedocs.org/en/latest/
+[nosetests]: https://nose.readthedocs.org/en/latest/usage.html
+[R]: http://www.r-project.org/
+[Anaconda-CE]: http://continuum.io/anacondace.html