Add settings

mobile/src/main/java/be/mygod/vpnhotspot/App.kt

@@ -4,12 +4,20 @@ import android.app.Application
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.os.Build
+import android.preference.PreferenceManager
 
 class App : Application() {
+    companion object {
+        lateinit var app: App
+    }
+
     override fun onCreate() {
         super.onCreate()
+        app = this
         if (Build.VERSION.SDK_INT >= 26) getSystemService(NotificationManager::class.java)
                 .createNotificationChannel(NotificationChannel(HotspotService.CHANNEL,
                         "Hotspot Service", NotificationManager.IMPORTANCE_LOW))
     }
+
+    val pref by lazy { PreferenceManager.getDefaultSharedPreferences(this) }
 }