Integrate Firestore database

plugins/firebase.js

@@ -1,5 +1,6 @@
 import { initializeApp } from 'firebase/app'
 import { getAuth } from 'firebase/auth'
+import { getFirestore } from 'firebase/firestore'
 
 // Firebase configuration
 const firebaseConfig = {
@@ -17,8 +18,12 @@ const app = initializeApp(firebaseConfig)
 // Initialize Firebase Authentication and get a reference to the service
 const auth = getAuth(app)
 
+// Initialize Cloud Firestore and get a reference to the service
+const db = getFirestore(app)
+
 export default ({ app }, inject) => {
-  // Inject $auth in Vue, context and store.
+  // Inject $auth and $db in Vue, context and store.
   // Ref: https://nuxtjs.org/docs/directory-structure/plugins/
   inject('auth', auth)
+  inject('db', db)
 }