I have just recently started working with Android development and the Qt GUI Creation for C++, and I would like to try and contribute to KDE. Would I be able to work with KDE with windows or would I need to switch to Linux?
Any help on where to start would be highly appreciated.

Thanks,
Vishal

KDE on Windows should be in a very usable stable state (see https://windows.kde.org/ for more information), so you should be able to run/test/debug/develop KDE from Windows as well.
There is also a forum dedicated to KDE on Windows under KDE Software -> Operating System Specific -> Windows, where you can ask more specific questions.
I'm sure your willingness to help and contribute will be most welcome.