docs : ReadMe 작성

 - 백엔드 readMe  작성 시작 
 - 초안 설계 
#33

README.md

@@ -1 +1,56 @@
-# miniBacktesting_be
+# Back&Stock
+
+<img src="https://user-images.githubusercontent.com/44867889/160368796-0c483aeb-ebc3-45b2-9534-cf22ee657458.png" width="80%" height="80%">   
+
+## 프로젝트 소개  
+내 주식! 그때 샀다면 지금은 얼마일까?   
+
+#### 🔗 [Back&Stock](https://backandstock.com/)
+
+
+주식 백테스팅 서비스 Back & Stock 입니다.    
+백테스팅 기간과 자산별 비율을 설정하면 수익률을 확인 할 수 있어요.   
+한국의 코스닥, 코스피 상장 주식들을 백테스팅 할 수 있습니다.     
+저장한 포트폴리오끼리 비교가 가능합니다.    
+Back & Stock에서 백테스팅을 시작하세요!      
+
+
+## 🛩️ Team Members 
+**`Back-end (Spring)`**
+- 김정근, 정선모, 박유선(Team Leader)
+
+**`Frontend (React)`**
+- 오예준, 안소진
+
+**`Design`**
+- 안수현, 이혜림
+
+
+## 🥇 ERD      
+
+<img src="https://user-images.githubusercontent.com/44867889/160381158-175be13e-af10-4811-8c02-416ec278d1d1.png" width="80%" height="80%">   
+
+
+## API   
+
+#### 🔗 [API link](https://www.notion.so/e72d3d2dc8d04e0380a27a4ea022571f?v=16e46006276e41f8a48c3e398d52fd57)
+
+
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+