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"))
+    }

android/app/google-services.json

@@ -0,0 +1,29 @@
+{
+  "project_info": {
+    "project_number": "1071558853812",
+    "project_id": "opplens",
+    "storage_bucket": "opplens.firebasestorage.app"
+  },
+  "client": [
+    {
+      "client_info": {
+        "mobilesdk_app_id": "1:1071558853812:android:7831119a56a99c5948c3e1",
+        "android_client_info": {
+          "package_name": "com.opplens.app"
+        }
+      },
+      "oauth_client": [],
+      "api_key": [
+        {
+          "current_key": "AIzaSyD5LaGXppjGEdTf-a0Ha25FX1p0v_h-c8A"
+        }
+      ],
+      "services": {
+        "appinvite_service": {
+          "other_platform_oauth_client": []
+        }
+      }
+    }
+  ],
+  "configuration_version": "1"
+}