[Improvement] Move to create-react-app (#17, #15)

src/config/environment.dev.ts

@@ -0,0 +1,10 @@
+export const environment = {
+  firebase: {
+    apiKey: 'AIzaSyAHOZ7rWGDODCwJMB3WIt63CAIa90qI-jg',
+    authDomain: 'test-4515a.firebaseapp.com',
+    databaseURL: 'https://test-4515a.firebaseio.com',
+    projectId: 'test-4515a',
+    storageBucket: 'test-4515a.appspot.com',
+    messagingSenderId: '964743099489'
+  }
+}