Updated readme.

README.md

-See the wiki for documentation.
+# Public Documentation Repository
+
+For access to diagrams and documents, use the directory-like listing above.  When 
+clicking on a filename in the listing, a page will open up with a large "Download"
+option.  That link will download the file.  However, clicking the "Raw" button on
+the upper right of that download page will open the file in the browser's default
+application.
+
+For the technical overview document and related pages, see 
+[this repository's wiki](http://gitlab.iath.virginia.edu/snac/Public-Documentation/wikis/home).