Initial work on implementing Pokemon

PkmnLib.Dynamic/Events/Handling/EventData.cs

@@ -0,0 +1,11 @@
+namespace PkmnLib.Dynamic.Events;
+
+/// <summary>
+/// An event is something that happens during a battle. This can be used by front-end code to
+/// display information about the battle to the user. This is the only way for the front-end to
+/// know what is happening in the battle.
+/// </summary>
+public interface IEventData
+{
+    public EventBatchId BatchId { get; init; }
+}