added firebase for notification

android/app/build.gradle.kts

@@ -3,6 +3,7 @@ plugins {
     id("kotlin-android")
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
+    id("com.google.gms.google-services")
 }
 
 android {
@@ -42,3 +43,7 @@ android {
 flutter {
     source = "../.."
 }
+
+dependencies {
+    implementation(platform("com.google.firebase:firebase-bom:32.7.2"))
+    }