adds rest communication

- test cases for push and pop
- rest singleton instantiated in MainApplication
  access through context
- pop and peek work, push needs encryption process
  still

app/build.gradle

@@ -4,12 +4,12 @@ plugins {
 }
 
 android {
-    compileSdk 32
+    compileSdk 30
 
     defaultConfig {
         applicationId "com.maenle.bump"
         minSdk 29
-        targetSdk 32
+        targetSdk 30
         versionCode 1
         versionName "1.0"
 
@@ -37,6 +37,7 @@ android {
 dependencies {
 
     implementation 'com.google.android.gms:play-services-mlkit-barcode-scanning:16.1.4'
+    implementation 'com.android.volley:volley:1.2.0'
     def camerax_version = "1.0.2"
     implementation 'androidx.core:core-ktx:1.3.2'
     implementation 'androidx.appcompat:appcompat:1.2.0'
@@ -47,7 +48,7 @@ dependencies {
     implementation "androidx.camera:camera-camera2:$camerax_version"
     implementation "androidx.camera:camera-lifecycle:$camerax_version"
     implementation 'com.google.zxing:core:3.3.0'
-    implementation "androidx.camera:camera-view:1.0.0-alpha31"
+    implementation "androidx.camera:camera-view:1.0.0-alpha20"
     implementation 'com.macasaet.fernet:fernet-java8:1.4.2'
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'