What is NativeUI and Why You Need It for GTA 5

This may be a very obvious question, but I have looked around and can't find an answer. I have made a menu using Visual Studio, but how do I get that as a .dll or something like the mod menus you can download so that I can put it in the game files and test it out.

download nativeui for gta 5

I have been at this for a while trying many different combinations of files in my GTA installation. I downloaded the latest scripthookV which solved the issue of it immediately crashing, but is there anything else I may need to use the scripts folder?