Code Documentaion of GUI_module

[shrehs]

Issue: GUI_module files lack documentation such as inline comments, DocStrings for better code readability

About project: The project is about Unified Travelling and Transport system which provide features such as real time tracking, payment options and fare estimation. My understanding about the project: I could relate it to the system which already exists in today's systtem UPI, I think that could be part where the idea could be generated. Able to document the code would make it easier to contributors to contribute much easier.

I believe I could work on this issue. Please consider my request to be assigned to this issue Thank you.