added booleans.py

[Dave3130]

Please fill in this pull request template before submitting

1. This pull request resolves #4

2. Description

I have updated booleans.py file in the required format as mentioned with proper description and a challenge.

3. Fill in checklist by marking [x]

• [x] I've read the CONTRIBUTING.md
• [x] I was assigned to this issue
• [x] My code is formatted using required linting
• [x] I've run my code locally and checked it works

[funbeedev]

@Dave3130 made some small edits to the formatting. but overall great, thanks!!

[Dave3130]

Okay !!