Add QR code generation for easy mobile connection

[HiddenKeyDev]

Description

Generate a QR code that mobile devices can scan to automatically connect to the hotspot.

Desired behavior

\\�ash
nm-hotspot qr

Displays QR code in terminal that can be scanned

\\

Implementation hints

• Use \qrencode\ package to generate QR codes
• Format: WIFI:S:;T:WPA;P:;;
• Display in terminal or save to file
• Add optional --save flag to save QR code as image

Difficulty

Medium