Add drawer widget
This is the widget from issue #25 (closed) "bottom sheet / transient sidebar (partially overlaid layer that can be swiped in/out)". Common uses would be the application drawer and notification bar, as well as for music apps which commonly use this pattern.
Here's a video of it in action: video
The demo could probably use a little more polishing with the different positions (or maybe just get rid of them), and I'm not sure whether tests are a requirement. I'm also note sure about the name, but drawer seemed to fit.