It's just a resolution, not a law. It's similar to a state writing a resolution to honor a sports team, a person who does something great, or an historic building. It doesn't require anyone to do anything, doesn't give anyone a day off, or make anyone pay more for anything. Every state does this stuff, just not necessarily for a gun.
Here's a stupid AZ law- "Donkeys cannot sleep in bathtubs."
From
http://www.dumblaws.com/laws/united-states/arizona
Here's a gem from Wisconsin- "Whenever two trains meet at an intersection of said tracks, neither shall proceed until the other has", from the same link.