Adds dependencies for RxJava.

build.gradle

@@ -38,6 +38,9 @@ buildscript {
         constraintlayoutVersion = '1.1.3'
         lifecycleExtensionVersion = '2.2.0'
         lifecycleViewModelVersion = '2.2.0'
+        rxandroidVersion = '2.0.1'
+        rxjavaVersion = '2.1.6'
+        adapterrxjava2Version = '2.3.0'
 
         groupName = 'com.wireguard.android'
     }

ui/build.gradle

@@ -90,6 +90,10 @@ dependencies {
     implementation "androidx.constraintlayout:constraintlayout:$constraintlayoutVersion"
     implementation "androidx.lifecycle:lifecycle-extensions:$lifecycleExtensionVersion"
     implementation "androidx.lifecycle:lifecycle-viewmodel:$lifecycleViewModelVersion"
+    //RxJava
+    implementation "io.reactivex.rxjava2:rxandroid:$rxandroidVersion"
+    implementation "io.reactivex.rxjava2:rxjava:$rxjavaVersion"
+    implementation "com.squareup.retrofit2:adapter-rxjava2:$adapterrxjava2Version"
 }
 
 tasks.withType(JavaCompile) {