Add "List & Collections" Section

[danielcristho]

After learning strings, learners need to understand how to store and manage multiple values in Python. This material is a foundation for loops, conditionals, etc.

Scope of Material

This section should introduce core collection concepts, focusing mainly on lists:

• What is a list in Python

• Creating lists

• Accessing elements (indexing)

• Modifying list values

• List methods that are often used:

1. .append()
2. .insert()
3. .remove()
4. .pop()
5. .sort()
6. .len()

• List slicing

Intro to other collections:

1. tuple
2. set
3. dict