Adds a sign, and applicable sprite, to indicate that an area is shielded against the Radiation Storm event. (#22676)

Modders/Mappers resource for now. Does as the title says. The sprite's
in, the sign's coded, but I didn't actually place any of these around
the ship.

code/game/objects/structures/signs.dm

@@ -355,6 +355,11 @@
 	desc = "A hazard sign which reads \"RADIATION HAZARD\"."
 	icon_state = "radiation"
 
+/obj/structure/sign/radshield
+	name = "\improper RADIATION SHELTER sign"
+	desc = "A sign that gives directions towards radiation-shielded areas."
+	icon_state = "radshield_arrow"
+
 /obj/structure/sign/drop
 	name = "\improper DANGER: DROP HAZARD sign"
 	desc = "A danger sign which reads \"DANGER: DROP HAZARD\"."

html/changelogs/RadshieldIcon-ASmallCuteCat.yml

@@ -0,0 +1,58 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#     - (fixes bugs)
+#   wip
+#     - (work in progress)
+#   qol
+#     - (quality of life)
+#   soundadd
+#     - (adds a sound)
+#   sounddel
+#     - (removes a sound)
+#   rscadd
+#     - (adds a feature)
+#   rscdel
+#     - (removes a feature)
+#   imageadd
+#     - (adds an image or sprite)
+#   imagedel
+#     - (removes an image or sprite)
+#   spellcheck
+#     - (fixes spelling or grammar)
+#   experiment
+#     - (experimental change)
+#   balance
+#     - (balance changes)
+#   code_imp
+#     - (misc internal code change)
+#   refactor
+#     - (refactors code)
+#   config
+#     - (makes a change to the config files)
+#   admin
+#     - (makes changes to administrator tools)
+#   server
+#     - (miscellaneous changes to server)
+#################################
+
+# Your name.
+author: ASmallCuteCat
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, this gets changed to [] after reading.  Just remove the brackets when you add new shit.
+# Please surround your changes in  double quotes ("). It works without them, but if you use certain characters it screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - imageadd: "Adds a sprite meant to be used by a sign that indicates a particular area is shielded against the Radiation Storm event."