Add intro comments and queue of ideas to TODO list

TODO.md

@@ -1,2 +1,20 @@
 # TODO
 
+This is a list of things to do. First is a list of tasks in the order they 
+will be implemented. Following that is a scratchpad of ideas and things that
+might be useful. These will either get fleshed out and turned into tasks or 
+discarded.
+
+## Tasks
+
+Here is what is planned, roughly in the order it will be implemented:
+
+## Ideas
+
+This area is permanent work in progress. It's a collection of ideas, not all of 
+them sensible, and things that might be useful some day or never.
+
+### Add a makefile target to rename the app
+
+The name of the app, app_projects, appears all over the place. Add a Makefile
+target that uses sed to rename app_project to the app that will be developed.