Add about dialog and licenses activity

build.gradle

@@ -10,6 +10,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:3.5.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath 'com.jaredsburrows:gradle-license-plugin:0.8.5'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }