add push notif firebase

build.gradle.kts

@@ -1,7 +1,12 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
     dependencies {
         classpath ("androidx.navigation:navigation-safe-args-gradle-plugin:2.5.1")
+        classpath ("com.google.gms:google-services:4.4.2")
     }
 }