Break TODOs into 'must haves' and 'maybes'; add Google App Engine sup…

…port into 'maybes'

README.markdown

@@ -21,6 +21,8 @@ Finally, MNML will be covered by extensive unit tests!
 TODO
 ----
 
+### Must haves
+
 * Unit tests;
 * URL reversing;
 * Shortcuts for redirects, gone, 404 etc;
@@ -34,6 +36,10 @@ TODO
 * More unit tests;
 * Production WSGI interface for Apache etc.
 
+### Maybes
+
+* SCGI support so Google App Engine can run it
+
 Recommended Extensions
 ----------------------