add dependency update tool

Author: zfdang

app/build.gradle

@@ -66,8 +66,6 @@ android {
             }
         }
     }
-
-
 }
 
 dependencies {

build.gradle

@@ -1,12 +1,18 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
+apply plugin: "com.github.ben-manes.versions"
+
 buildscript {
     repositories {
         google()
         jcenter()
+        gradlePluginPortal()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:7.2.1'
 
+        // https://github.com/ben-manes/gradle-versions-plugin
+        classpath 'com.github.ben-manes:gradle-versions-plugin:+'
+
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }