Direct Messages can use redux for creating new DM channels

twistter-frontend/src/redux/reducers/dataReducer.js

@@ -0,0 +1,17 @@
+import {SET_DIRECT_MESSAGES, SET_USERNAME_VALID, SET_USERNAME_INVALID} from '../types';
+
+const initialState = {
+    directMessages: null,
+};
+
+export default function(state = initialState, action) {
+    switch(action.type) {
+        case SET_DIRECT_MESSAGES:
+            return {
+                ...state,
+                directMessages: action.payload
+            };
+        default:
+            return state;
+    }
+}