How to use dub with our own package

[Vinod K Chandran]

Hi all,
I am creating a hobby project related with win api gui functions. 
i would like to work with dub. But How do I use dub in my project.
1. All my gui library modules are located in a folder named 
"winglib".
2. And that folder also conatains a d file called "package.d"
3. "package.d" contains all the public imports.
4. Outside this winglib folder, I have my main file called "app.d"
5. "app.d" imports "winglib".
So in this setup, how do I use dub ? Thanks in advance.