Add ShowRules commmand (#5908)

Content.Server/Info/RulesManager.cs

@@ -0,0 +1,15 @@
+using Content.Shared.Info;
+using Robust.Shared.IoC;
+using Robust.Shared.Network;
+
+namespace Content.Server.Info;
+
+public class RulesManager : SharedRulesManager
+{
+    [Dependency] private readonly INetManager _netManager = default!;
+
+    public void Initialize()
+    {
+        _netManager.RegisterNetMessage<ShowRulesPopupMessage>();
+    }
+}