Update README.md add Event Storming

- 설계서 부분 추가
- 이벤트 스토밍 초기단계 추가

README.md

@@ -10,3 +10,19 @@
         <td align="center"><a href="https://github.com/hoon7566"><img src="https://avatars.githubusercontent.com/u/48042490?v=4?s=100" width="100px;" alt="" /><br /><sub><b>hoon7566</b></sub></a><br /></td>
     </tr>
 </table>
+
+## 📋 설계서
+
+### 이벤트 스토밍 (Event Storming)
+
+#### 초기 단계
+<table>
+    <tr>
+        <td align="center">
+            <img src="https://user-images.githubusercontent.com/72686708/150717364-6a6d04a6-89bc-42c2-b3a7-8634fc86bed2.jpg" width="500" height="500"/>
+        </td>
+        <td align="center">
+            <img src="https://user-images.githubusercontent.com/72686708/150717369-fed92a58-d27b-4126-9709-80b16f6c930d.jpg" width="500" height="500"/>
+        </td>
+    </tr>
+</table>