docs: create TODO.md (#13)

TODO.md

@@ -0,0 +1,25 @@
+This Week's Demo
+* Platform support (e.g. push to both arm7 and arm64)
+* API Keys (allows multiple users)
+* Separate product ids (allows multiple users)
+* Instructions on how to build/use.
+
+User journey, someone can:
+* download and install Shorebird.
+* `shorebird build` their existing Flutter app.
+* Push an update to their app.
+
+Later
+* Way to see what builds have been published so far.
+* See what % of devices are running what builds.
+* Make package:updater API work from Dart
+* Example of using Dart API from Dart/Flutter.
+* Ability to roll back to past push.
+* Build update from source (in the cloud).
+* GitHub integration / action trigger.
+* Quantify update download sizes.
+* Be able to create an account / API key.
+* Web interface to see pushes?
+* Security (signing, 2FA, 2-person approval, etc.)
+* Quantify how much bandwidth a push will use.
+* What % of device population has taken push.