Started implementing username and password check

backend/src/app.py

@@ -119,6 +119,14 @@ def refresh():
     return ret, 200
 
 
+@app.route('/api/username', methods=['GET'])
+@flask_praetorian.auth_required
+def get_username():
+    user = flask_praetorian.current_user().username
+    ret = {'username': user}
+    return user, 200
+
+
 @app.route('/api/protected')
 @flask_praetorian.auth_required
 def protected():