Binary Search Tree - Level Order Traversal

[Manasi2001]

Have you read the Contributing Guidelines on Pull Requests?

Yes

Description

Added the program with proper explanation.

Checklist

• [x] I've read the contribution guidelines.
• [x] I've checked the issue list before deciding what to submit.
• [x] I've edited the README.md and link to my code.

Related Issues or Pull Requests

This PR is with reference to issue #7504.