Todo App Requirements Each category has its own list of tasks and shows only them (when a category is selected); Each category could have nested category; Selected category should be highlighted, a section with todos should be shown at the right; If no category is selected hide right section with todos input; There should be a possibility to edit selected todo: implement Save changes and Cancel buttons when edit todo; implement a filter bar with possibility to show only done todos and possibility to search a todo by name: implement a progress bar at the bottom of app header (it should show a progress of todos which marked as done); use redux to store your data; use react-router to handle ui state while clicking on category or a particular todo;
