adding docs subtree

docs/step1-05/exercise/README.md

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+## Exercise
+
+### TodoFooter
+
+1. Update the TodoFooter component, copying over the `<footer>` tag and all of its children
+2. Remove any `onclick` properties, and change `class` to `className`
+
+### TodoList
+
+1. Update the TodoList component like you did with the footer.
+2. Import TodoListItem and add 4 of them inside of the `<ul>`
+3. Bonus points for using a [`for`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration) loop or using [`map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map) to create 4 list items based on the array `[1,2,3,4]`