Fix Gradle build files

Author: RandomShaper

build.gradle

@@ -5,6 +5,19 @@ buildscript {
         google()
         jcenter()
     }
+    dependencies {
+        classpath "com.android.tools.build:gradle:4.0.1"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
 }
 
 android {

gradle.properties

@@ -0,0 +1,2 @@
+android.useAndroidX=true
+android.enableJetifier=true