Add TODO so we know what to do

Author: forkata

TODO.md

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+In-Memory Order Updater TODO
+===
+
+- [ ] Finish renaming methods that don't persist ever
+- [ ] Consider Sofia's recommendation to break this class into POROs to simplify testing
+- [ ] Address FIXME on renaming `recalculate_adjustments`?
+- [ ] Add test coverage for `update_item_total` when line item totals change
+- [ ] Test coverage to ensure state changes aren't persisted (if someone changes current implementation)
+- [ ] Handle persistence in `update_promotions`
+- [ ] Handle persistence in `update_taxes`