Add QR method

[jalmirante]

Good evening, I was able to add the qr method manually, at least it works for me.

I would appreciate it if you could incorporate this method into the plugin accordingly as it is very useful.

Thanks in advance for the plugin that works excellent and is very useful.

File: SunmiPlugin.java

@PluginMethod(returnType = PluginMethod.RETURN_NONE)
public void qr(PluginCall call) throws RemoteException {
if (mPrinterService != null) {
String data = call.getString("data");
int size = call.getInt("size");
int errorlevel = call.getInt("errorlevel");

        mPrinterService.printQRCode(data, size, errorlevel, null);
    }
}

File: definitions.ts

qr(options: {
data: string;
size: 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16;
errorlevel: 0 | 1 | 2 | 3;
}): void;