adding documentation

docs/step1-07/README.md

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+already done
+Types in header
+TodoApp methods
+
+filteredTodos in List
+
+demo
+
+## app
+
+Add Types to TodoApp
+change 'filter' state value to demonstrate
+
+## List (open list next to app)
+
+Demo TodoApp.types
+Add Types in List
+
+## App
+
+Back to App, add complete={this.\_complete} to Todolist - show types, change complete to 'false', filter
+
+## List
+
+add complete, pass to item (prop drilling)
+
+## List Item (move List Item into App window)
+
+TodoListItemProps, extend, id, complete (possible abstraction)
+add props, add complete to List item
+
+## List
+
+Demo how you can't add random things to TodoListItem or item's this.props now
+
+exercise
+
+Add types to footer
+Add onClick to button
+Add types to header
+Add setFilter to filter buttons
+write onAdd function
+place onAdd to submit button