add: Прототип гранатомета СБ (#479)

Content.Server/_White/Explosion/TriggerOnLandSystem.cs

@@ -0,0 +1,19 @@
+using Content.Server.Explosion.EntitySystems;
+using Content.Shared.Throwing;
+
+namespace Content.Server._White.Explosion;
+
+public sealed class TriggerOnLandSystem : EntitySystem
+{
+    [Dependency] private readonly TriggerSystem _timer = default!;
+
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<TriggerOnLandComponent, LandEvent>(OnLand);
+    }
+
+    private void OnLand(EntityUid uid, TriggerOnLandComponent component, ref LandEvent args)
+    {
+        _timer.HandleTimerTrigger(uid, null, component.Delay, 1, null, null);
+    }
+}