Add todo app layout

Author: Sahil

README.md

@@ -15,4 +15,5 @@ To discuss any doubts or questions after today's class with the community, join
 - Lecture 2: [[Notes]](/lecture2.md) [[Video]](https://www.youtube.com/watch?v=Q7nvvSlWem4) - Operators, Basic Control Flow - Conditionals, Loops and Functions
 - Lecture 3: [[Notes]](/lecture3.md) [[Video]](https://www.youtube.com/watch?v=tmxCgqNSj88) - Basic Data Structures and Containers: Lists, Tuples, Sets, Dictionaries
 - Lecture 4: [[Notes]](/lecture4.md) [[Video]](https://www.youtube.com/watch?v=NsOzuuLlR08) - Organizing Code & Dependency Management
-- Lecture 5: [[Notes]](/lecture5.md) [[Video]](https://www.youtube.com/watch?v=kj61srFJ9fY) - File I/O, reading and writing text, csv and json files
+- Lecture 5: [[Notes]](/lecture5.md) [[Video]](https://www.youtube.com/watch?v=kj61srFJ9fY) - File I/O, reading and writing text, csv and json files
+- Lecture 6: [[Notes]](todo_cli/README.md) [[Video]](https://www.youtube.com/watch?v=tHDoTDpfRE4) - Building a Todo CLI App with Python

todo_cli/README.md

@@ -0,0 +1,33 @@
+# Todo Command Line Application
+
+## Create a virtual environment (optional)
+
+Python 3:
+```
+$ pip3 install virtualenv
+$ virtualenv -p python3 venv
+```
+
+Activate the environment:
+
+```
+source venv/bin/activate
+```
+
+## Use cases
+
+- Create a todo list
+- Add, Edit and Delete todo items in a todo list
+- Mark todo items as complete and incomplete
+- Show all todo items in a todo list
+
+## Commands
+
+1. `todo lists`
+2. `todo use list`
+3. `item add item_names`
+4. `item list`
+5. `item edit item_id new_item_name`
+6. `item remove item_id`
+7. `item complete item_id`
+8. `item incomplete item_id`