0.1 preview release

Preview of CLI utility for FIDO2/U2F devices.

Conceptual release plan:

• v0.1 - initial MVP/POC
• v0.5 - semi-stable internal design
• v0.9 - most features implemented, design fixed. Release of x-fido-applet
• v1.0 - first release that is not pre-release with all TODO/FIXME/XXX solved
• v1.1 - feedback issues fixed
• vX.X.X - move to CalVer