Completely New to ImGUI


I am completely new in the world of GUI and want to learn how to setup ImGUI in my Desktop.
I have downloaded ImGUI master files, i want to know what to do with it.
They are basically just C++ files and header.
I tried opening the ImGUI in Codeblocks and Compiling it yield near 100 errors.
I really need help getting started with making a basic gui with text and button.
is there an app or environment which can help me understand the basics.