adding exercise for step 7

step2-07/demo/src/index.tsx

@@ -0,0 +1,29 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { reducer } from './reducers';
+import { createStore, compose } from 'redux';
+import { Provider } from 'react-redux';
+import { TodoApp } from './components/TodoApp';
+import { actions } from './actions';
+import { initializeIcons } from '@uifabric/icons';
+
+/* Goop for making the Redux dev tool to work */
+declare var window: any;
+const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
+function createStoreWithDevTool(reducer, initialStore) {
+  return createStore(reducer, initialStore, composeEnhancers());
+}
+
+const store = createStoreWithDevTool(reducer, {});
+
+store.dispatch(actions.addTodo('hello'));
+store.dispatch(actions.addTodo('world'));
+
+initializeIcons();
+
+ReactDOM.render(
+  <Provider store={store}>
+    <TodoApp />
+  </Provider>,
+  document.getElementById('app')
+);