Stream Feeds Flutter tutorial

This is the final version of the tutorial. To follow along:

• Checkout and go to the initial commit:

TODO - create release tag for tutorial-start

# or download zip from https://github.com/GetStream/stream-feeds-flutter-tutorial/releases/tag/tutorial-start
git clone git@github.com:GetStream/stream-feeds-flutter-tutorial.git
git checkout tutorial-start

• Follow instructions from: TODO - tutorial isn't yet deployed

If you just want to run the final tutorial, provide your credentials in main.dart.