Add support for proxy settings

[Stephanos Komnenos]

Hi.
I hope if it's possible to add proxy settings to this app's settings page.

We could use adb to set proxy:
adb shell settings put global http_proxy <ip:port>
where the ip is the IP of your Windows machine for vEthernet (WSL) interface.

(On my machine it is vEthernet (WSL) interface, but I don't know if it will be different on other machines. )