Make the README.md more useful.

Author: joey-coleman

README.md

@@ -1,2 +1,7 @@
-newsite
-=======
+# The Overture Tool Website
+
+This repository holds the source of the Overturetool.org website.  It uses the Jekyll-based GitHub Pages service to transform the pages into something more interesting than raw markdown-formatted text.
+
+Editing may be done directly on the repository web interface, or it may be checked out as a git repository and manipulated locally.  (Anything but trivial changes are likely to need the latter approach.)
+
+Please file bugs about the website in the [issues tracker for this repository](https://github.com/overturetool/overturetool.github.io/issues).