Add TODO list

TODO.md

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+# 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:
+
+### Upgrade the layout so it follows django-app-template
+
+Status: In project
+
+Freshen the project structure, so it matches the django-app-template where 
+needed. For example move the demo code from apps into demo.
+
+Leave out the Docker related files - an SQLite database is all that's needed
+to demonstrate how the filter works.
+
+## 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.
+
+### Discard the change_list.html template
+
+Currently, you need to set the changelist template in a ModelAdmin to pick up 
+the css and js files needed to display the daterange filter. That makes it a 
+little more awkward to use, particularly if you use apps like django-suit to 
+restyle the admin. Double check simplifying adding the css and js in a Media
+class is enough to inject the elements need to style the filter correctly.