Add damage system and processing system to enemy

Assets/Scripts/Data/Damage.cs

@@ -0,0 +1,41 @@
+using Sirenix.OdinInspector;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[Serializable]
+public class Damage
+{
+    public int value;
+
+    public static Type[] damageTypes = Type.all;
+
+    [ValueDropdown("damageTypes")]
+    public Type type;
+
+    [Serializable]
+    public class Type
+    {
+        private string name;
+
+        private Type(string name)
+        { 
+            this.name = name;
+        }
+
+        public static Type normal = new("normal");
+
+        public static Type poison = new("poison");
+
+        public static Type[] all = new Type[] {
+            normal,
+            poison
+        };
+
+        public override string ToString()
+        {
+            return name;
+        }
+    }
+}

Assets/Scripts/Data/Damage.cs.meta

@@ -0,0 +1,11 @@
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