Snapshot return error firebase

UI and View Lifecycle flow

Fixed Storyboard identifier bug and add logout function to UIButton

Implement sign out function to Login VC

getUsername function implement in DataService

Reverse array of messages to view recent at top

Populate tableView with message in FeedVC

getAllFeedMessages method implementation

Create Message model

Feed VC & Custom feed cell file

Fix Badly formatted email login error

CreatePost UI & VC with Post function to send message to Firebase

Create MeVC UI and Controller

Fix dismiss error after login

Feed & Groups UI and VC