shows qr code with app, adds black design

- qr code is generated from text code
- password is shown as well, when clicking
  on the 'view' icon
- hides top view
- removes floating button
- display status is now in an own class

app/build.gradle

@@ -54,6 +54,7 @@ dependencies {
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    implementation 'androidmads.library.qrgenearator:QRGenearator:1.0.3'
 }
 
 apply plugin: 'com.google.gms.google-services'  // Google Play services Gradle plugin