need additional Info in readme

[ifrh]

From README.md it is not clear fo me,
if that library can be installed on iOS (iPhone, iPad) and used there
to connect a network printer (IPP-Protocoll) for printing.
Sadly that network printer is not findable while with iOS AirPrinter-search,
but other systems (Windows,Linux) can print on that printer via WLAN using IPP.

[ifrh]

If you can update your README.md than perhaps you can add a section for Android devices, too.
Thanks alot.