Add captive portal

[brainelectronics]

Add a captive portal like Micropyton Captive Portal

[ned-pcs]

I'm working on this right now.

[ned-pcs]

I have it working on an ESP32 without SPIRAM (after frozen compilation); it should also work from the filesystem. Try this branch.

[brainelectronics]

Thanks for you contribution. I would really love to have this in, but it looks like your repo is no longer there or more likely not public. I should find some time today or tomorrow to review your changes, merge and release it

[ned-pcs]

The repo is public: https://github.com/Product-Creation-Studio/Micropython-ESP-WiFi-Manager

[ned-pcs]

I just rebased it on the (upcoming!) 1.13.0; I'll submit it as a PR.