Create Day 29: Bitwise AND

Create Day 28: RegEx, Patterns and Intro to Databases

Create Day 27: Testing

Crated Day 26: Nested Logic

Create Nested Logic

Update README.md

Create Day 22: Binary Search Trees (C#)

Create Day 25: Running Time and Complexity (C#)

Update Day 24: More Linked Lists (C#)

Create Day 24: More Linked Lists (C#)

Create Day 23: BST Level Order Traversal (C#)

Rename Day 21: Generics to Day 21: Generics (C#)

Create Day 21: Generics

Create Day 20: Sorting

Create Day 19: Interfaces (C#)