connecting to remote mysql db, saving market alerts

frontend-react/src/reducers/userdata.js

@@ -0,0 +1,10 @@
+import { USER_DATA_CHANGED } from "constants/actionTypes";
+
+export default (state = {}, action) => {
+  switch (action.type) {
+    case USER_DATA_CHANGED:
+      return { ...state, [action.info]: action.value };
+    default:
+      return state;
+  }
+};