Make this readme into a proper file instead of a series of out-of-date

notes. Format is the same as the existing Unix "README" file. Add
various documentation about installation, current bugs, etc.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79438 13f79535-47bb-0310-9956-ffa450edef68