Fixed issue: io-conditionals.md (Improved switch statement)

[ananya0504]

Fixes #9

Short description of what this resolves:

improve: Input/Output & Conditionals #9

What Changes proposed in this pull request:

• Explained the workflow of the switch statement in depth
• Added a diagram for better understanding and added it in the 'images' folder
• Explained the 'break' and 'default' keyword
• Added a better code snippet than the previous one
• Added 1 code snippet to explain the working without the use of break statements
• Added a code snippet that uses a nested switch statement
• Added outputs for all code snippets

Checklist

• Added description of the change
• Added file name matches File name guidelines
• Added code examples, the test must pass
• Added documentation so that the program is self-explanatory and educational.
• Relevant documentation/comments is changed or added
• I acknowledge that all my contributions will be made under the project's license.

Notes:
Improved switch statement explanation in io-conditionals.md

[Utkarsh1504]

Awesome! Everything looks great, markdown, content, and code example everything.
Thank you for your super helpful contribution.🎉✨🎈