redux store of builder

src/reducers/index.js

@@ -1,8 +1,10 @@
 import { combineReducers } from 'redux';
 import workspaceReducer from './workspaceReducer';
 import tutorialReducer from './tutorialReducer';
+import tutorialBuilderReducer from './tutorialBuilderReducer';
 
 export default combineReducers({
   workspace: workspaceReducer,
-  tutorial: tutorialReducer
+  tutorial: tutorialReducer,
+  builder: tutorialBuilderReducer
 });