You should be able to make an iOS class library project and include these files in it with a build action of BundleResource
. I generally do this with binding projects where the Obj-C library includes a bunch of files you need to include with your app (it works for normal libraries, too though).
When referencing the library, it should copy the files to your application bundle. Keep in mind, however, you probably need to actually have some code in the class library you are calling from the main iOS application project. Xamarin.iOS may strip out the library if code inside is not being used.