Added exercises

step2-06/exercise/src/components/TodoFooter.tsx

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+import React from 'react';
+import { DefaultButton, Stack, Text } from 'office-ui-fabric-react';
+import { actions } from '../actions';
+import { useMappedState, useDispatch } from 'redux-react-hook';
+
+export const TodoFooter = () => {
+  // TODO: make use of useMappedState(state => state) and the useDispatch functions to get
+  // the Redux store and dispatching actions
+  // HINT: const { todos } = useMappedState(...);
+  // HINT: useDispatch() here too.
+  const todos = {};
+  const dispatch = (...args: any[]) => {};
+
+  const itemCount = Object.keys(todos).filter(id => !todos[id].completed).length;
+
+  return (
+    <Stack horizontal horizontalAlign="space-between">
+      <Text>
+        {itemCount} item{itemCount === 1 ? '' : 's'} left
+      </Text>
+      <DefaultButton onClick={() => dispatch(actions.clear())}>Clear Completed</DefaultButton>
+    </Stack>
+  );
+};