Small feature request: include resource in Exam introduction

[Spruce8913]

We would like to offer a formula sheet as included pdf for the whole exam. Currently we include an introductory question, include the pdf in its resources tab, and then include the link. It would be nicer if the pdf is included as a resource for the whole exam, and a link to that resource can be included in the exam introduction. This is definitely only a nice-to-have.