1) Read a .json file (as an alternative to .txt) with the same inform…

[DonnKey]

…ation, but in exactly the same format used for QR code provisioning, thus allowing the file to be used for both. Provide a sample .json. Add documentation.

2. Report some errors to the screen.
3. Document/support missing fields (HIDDEN, EXTRAS) fully so they can be used.
4. Deal with getting permission to read the file (on M and above).
5. In all files changed, fix any warnings and Analyze->Inspect issues (for default settings).
6. Add Use and Tips documentation.
7. Update library and gradle versions to current.

[DonnKey]

I've submitted this for your consideration. Take some or all as you wish. I'll help if I can but don't want merging to turn into a major project for me.

[pfmaggi]

The NFCProvisioning sample has been deprecated and deleted.