move files into more appropriate folders, remove empty Enemy script

game/Assets/Enemy.cs

@@ -1,17 +0,0 @@
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-
-public class Enemy : MonoBehaviour {
-    
-
-	// Use this for initialization
-	void Start () {
-		
-	}
-	
-	// Update is called once per frame
-	void Update () {
-		
-	}
-}

game/Assets/Enemy.cs.meta

@@ -1,12 +0,0 @@
-fileFormatVersion: 2
-guid: e626eaf86e7618a4993565126cc2f4a1
-timeCreated: 1501335703
-licenseType: Pro
-MonoImporter:
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: