Add sample for GeneralSwipeAction

The actual documentation is pretty poor: https://developer.android.com/reference/android/support/test/espresso/action/GeneralSwipeAction

Start with the GeneralSwipeAction reference linked in the issue, then inspect the repository’s existing testing samples for their structure and conventions. Add a sample that demonstrates GeneralSwipeAction, and verify that it builds and clearly covers the action’s documented behavior.

Written by the indexing model from the issue text.