Add Nested if condition in python conditionals file

[prathamk11]

Description

Nested if statements allow you to check a condition inside another condition. They are useful when decisions depend on multiple factors, as the outer condition is evaluated first, and only if it is True does the inner condition get checked. This structure helps make your code more organized, avoids repeating checks, and supports more complex decision-making in a readable way.

Type of Change

• Adding a new entry
• Editing an existing entry (fixing a typo, bug, issues, etc)
• Updating the documentation

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Hey @prathamk11, I'll have to lose this PR as this is on the main branch. If you plan to contribute to Codecademy Docs, please check the open issues and comment "Claim" on the one you want to work. Once a team member assigns that issue to you, you can raise a PR for that.