If you want just an empty template:
Empty NativeUI Template

This is a template I based off of Abel Software's template. His was a bit confusing if you were new (which I was by the time I downloaded his for the first time) but now I have gotten better and made my own template, explaining everything as much and good as I could. Hope you enjoy!

Installation instructions included in the download.
Read instructions carefully, happy modding!

Changelog in v4.0:
Added a video showing how to import the template (and install built DLL File into GTA5)

Credits: Abel Software

Abel Software's Template:
Abel's Template

Notes
People work hard at creating mods, so pay respect and don't leave hate when people upload, instead add constructive criticism and give them advice if you want them to upload "better" stuff.