Add a splash screen option to StoryMaps

[GISTeam8]

Allow a splash screen option similar to what exists in Web AppBuilder.

[AriIsaak1]

I'd like to add a splash screen in order to promote an upcoming webinar we are doing on the same topic. My storymap is within an iframe at another URL. I'll try to add the splash screen to the HTML wrapper, but it would be easier to do within the storymap.

[PamelaLocke1]

is this in the works?  Just came across a reason why we need a splashscreen for a storymap as well! 

[BrandonCrafword]

I'm also trying to add a splash page to a storymap. Curious if this is an option yet.