Document QR Code feature for WiFi Hotspot
Added documentation (note) for QR Code feature when a wifi hotspot is created. Since different platforms (and OEMs) have slightly different methods to connect using QR code i have left it as simple as possible to cover as many platforms as possible.
If needed I can also add step by step documentation for the "top 3" - Apple iOS/iPadOS, Android (stock/Pixel) and Samsung's skin.
Fixes #85 (closed)
Edited by Rohan Mishra