adding support for MMM-Modal module

[skuethe]

Adding support for it to work with the MMM-Modal module by @fewieden

When receiving a WIFIPASSWORD_MODAL notification, it will create a modal and show your wifi code on screen.

An example usecase

1. Using MMM-Modal with config

   {
     module: 'MMM-Modal',
     position: 'fullscreen_below',
     config: {
       timer: false,
       touch: true,
     }
   },

2. Using MMM-Touch with touchscreen display with following config:

   {
     // Have this at the bottom of your modules, or else it will "push" down other modules comming after it, even tho it is "hidden"
     module: "MMM-Touch",
     position: "top_right",
     config: {
       useDisplay: false,
       defaultMode: "showWifiQr",
       gestureCommands: {
         "showWifiQr": {
           "DOUBLE_TAP_1": (commander, gesture) => {
             // Show Wifi QR code
             commander.sendNotification("WIFIPASSWORD_MODAL")
           },
         }
       }
     }
   },

3. And, of course MMM-WifiPassword with your specific config

   {
     module: "MMM-WiFiPassword",
     position: "bottom_right",
     config: {
       qrSize: 300,
       network: "someNetwork",
       password: "mySuperSecretPassword",
       showNetwork: false,
       showPassword: false,
       showAuthType: false,
     }
   },

[fewieden]

@skuethe ouuh nice :heart_eyes: I think this is the first usage of MMM-Modal outside of my modules

[TeraTech]

This is fine, but can you update the Readme file to explain this functionality?

[skuethe]

Updated :)