Integrate Firestore database

store/index.js

@@ -1,5 +1,7 @@
 export const state = () => ({
-  firebaseInitialized: false
+  firebaseInitialized: false,
+  userLoggedIn: false,
+  courses: []
 })
 
 export const getters = {
@@ -8,6 +10,12 @@ export const getters = {
 export const mutations = {
   initFirebase (state) {
     state.firebaseInitialized = true
+  },
+  setUserLoggedIn (state, isLoggedIn) {
+    state.userLoggedIn = isLoggedIn
+  },
+  setCourses (state, courses) {
+    state.courses = courses
   }
 }