Add cvar to show new players in ahelp (#23265)

* Implement cvar

* Enable cvar on Wizden

Content.Shared/CCVar/CCVars.cs

@@ -804,6 +804,14 @@ namespace Content.Shared.CCVar
         /// </summary>
         public static readonly CVarDef<string> AdminAhelpOverrideClientName =
             CVarDef.Create("admin.override_adminname_in_client_ahelp", string.Empty, CVar.SERVERONLY);
+
+        /// <summary>
+        ///     The threshold of minutes to appear as a "new player" in the ahelp menu
+        ///     If 0, appearing as a new player is disabled. 
+        /// </summary>
+        public static readonly CVarDef<int> NewPlayerThreshold =
+            CVarDef.Create("admin.new_player_threshold", 0, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
+
         /*
          * Explosions
          */