Add list of actions for aktualizr, meta-updater, and related tools.
Add list of actions for aktualizr, meta-updater, and related tools.

Currently this mostly just lists the things that are covered by tests.
What would be really interesting is to start adding the things that are
*not* covered.

advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp