Support adding experience

PkmnLib.Dynamic/Events/LevelUpEvent.cs

@@ -0,0 +1,22 @@
+using PkmnLib.Dynamic.Models;
+
+namespace PkmnLib.Dynamic.Events;
+
+public class LevelUpEvent : IEventData
+{
+    public LevelUpEvent(IPokemon pokemon, int previousLevel, int newLevel)
+    {
+        Pokemon = pokemon;
+        PreviousLevel = previousLevel;
+        NewLevel = newLevel;
+    }
+
+    public int NewLevel { get; set; }
+
+    public int PreviousLevel { get; set; }
+
+    public IPokemon Pokemon { get; set; }
+
+    /// <inheritdoc />
+    public EventBatchId BatchId { get; init; }
+}