Add WPS mode for WiFi connection

[stritti]

For initial connection WPS should be supported.

See:

https://github.com/espressif/arduino-esp32/blob/master/libraries/WiFi/examples/WPS/WPS.ino

https://www.az-delivery.de/blogs/azdelivery-blog-fur-arduino-und-raspberry-pi/wps-mit-dem-esp8266