added encounter system

Packages/com.jovian.encounter-system/Runtime/IRewardKind.cs

@@ -0,0 +1,33 @@
+using System;
+
+namespace Jovian.EncounterSystem {
+    /// <summary>Polymorphic payload on a <see cref="Reward"/>. Add a new kind by implementing this interface.</summary>
+    public interface IRewardKind {
+    }
+
+    [Serializable]
+    public class CurrencyRewardKind : IRewardKind {
+        public string currencyId;
+        public int amount;
+    }
+
+    [Serializable]
+    public class ItemRewardKind : IRewardKind {
+        public string itemId;
+        public int quantity;
+    }
+
+    [Serializable]
+    public class ExperienceRewardKind : IRewardKind {
+        public int amount;
+    }
+
+    [Serializable]
+    public class UnlockableRewardKind : IRewardKind {
+        public string unlockableId;
+    }
+
+    [Serializable]
+    public class OtherRewardKind : IRewardKind {
+    }
+}