Add lecture 3 outline

Author: Sahil

README.md

@@ -13,3 +13,4 @@ To discuss any doubts or questions after today's class with the community, join
 # Lectures
 - Lecture 1: [[Notes]](/lecture1.md) [[Video]](https://www.youtube.com/watch?v=OrzXiZKtudA) - Installing Python, REPL, using Python as a calculator, basic data types, input and output
 - 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

day3/dictionaries.py

@@ -0,0 +1,28 @@
+# Day 3: Basic Data Structures
+
+## Day 2 Recap
+[Control Flow: Conditionals, Loops, Jump statements, functions](day3/recap.py)
+
+## More on Functions
+[Code](day3/functions.py)
+
+### Keyword Arguments
+
+
+### Function scope
+
+
+## Containers
+
+- [Lists](day3/lists.py)
+- [Tuples](day3/tuples.py)
+- [Sets](day3/sets.py)
+- [Dictionaries](day3/dictionaries.py)
+
+## Lists
+
+## Tuples
+
+## Sets
+
+## Dictionaries