웨이브, 몬스터 데이터 스키마 변경

- waveMaster, monsterMaster 테이블 관련 파일 제거
- monster 테이블 추가
- 데이터 작업 가이드 txt 파일 추가

Assets/Data/ScriptableObjects/Monster/Monster101.asset

@@ -0,0 +1,24 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &11400000
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 71f75742bf2af604ba55221e30379f4a, type: 3}
+  m_Name: Monster101
+  m_EditorClassIdentifier: Assembly-CSharp::Northbound.Data.MonsterData
+  id: 101
+  memo: "Grunt(\uAE30\uBCF8)"
+  moveSpeed: 2.6
+  maxHp: 30
+  atkRange: 1
+  atkDamage: 3
+  atkIntervalSec: 1.2
+  prefabPath: Assets/Prefabs/EnemyTest
+  cost: 1
+  weight: 1