Improve error management

[dhanvithnayak]

The error management in this project is quite rudimentary at its present state. Error management needs to be more complete and consistent.

Sub-issues can be created for the improvement in error management of each file separately and worked on one by one

[voodoovampire]

Hello @dhanvithnayak,

I have submitted PR #19 with initial improvements to error management:

• Fixed spelling error in shader error message
• Changed error output from cout to cerr for proper error stream
• Applied consistent error handling across files

This addresses part of issue #9. I'm happy to make further improvements based on your feedback.

Thank you for the opportunity to contribute.