Add Initialization rST document

Add a reStructuredText document that walks a user through the steps of
initializing a VistA instance to the point where CPRS is able to connect.

Add a link to the README pointing to this file.

OSEHRA-Id: http://issues.osehra.org/browse/OAT-116
Change-Id: Iecca3aadd59df21b9e9e4afb3340cc8d6daae6b6
Merge "Add Initialization rST document"