[R] Is it possible to include shiny code in a package?

[Marc Girondot]

Dear list member,
I would like to include shiny code within a package. My idea was to 
include a folder 'shiny' for example and to put in this folder the files 
server.R and ui.R required for shiny as well as the css file and a 
style.R file that call this css file.
Is it possible ?
When I call the build command, how to say to include this folder? Or are 
there other way to do?
Thanks a lot
Marc