Fixes#240.
To make this easier, I added a script to aid in downloading icons.
Checkout F-Droid/tools/download-material-icon.sh for more details.
The icons are licensed under the CCv4 attribution license, which I
added a shout out to under "License" in the README.md.
This is really just a placeholder, there is lots of work to be done here.
Really, this screen should have the SSID of the hotspot, but we need to use
a private API to get that. Coming soon...
The icon is free software from:
https://commons.wikimedia.org/wiki/File:Wifi.svg
