Edited README and added screenshot

Author: RichardLitt

README.md

@@ -1 +1,7 @@
-Please use [wiki/wiki](https://github.com/ethereum/wiki/wiki), since that is freely maintainable.
+# Wiki
+
+All of the content in this repository lives in the  [Wiki](https://github.com/ethereum/wiki/wiki).
+
+[![Screenshot](screenshot.png)](https://github.com/ethereum/wiki/wiki)
+
+There is no longer any code or documentation stored in this repository.