[Docs] README.md 추가

README.md

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+[![someup](https://github.com/user-attachments/assets/aa5243bc-e992-40b5-b83a-264d94581f44)](https://www.someup.site/)
+
+## 📘 프로젝트 인원 / 기간
+
+- **개발 인원**: [기획 1명 / 디자인 1명 / FE 2명 / BE 2명]
+- **개발 기간**: [2024.09 ~ 2024.10]
+
+### 🖥️ 백엔드 역할
+
+|                                    김용빈                                     |                                     이준섭                                     |
+|:--------------------------------------------------------------------------:|:---------------------------------------------------------------------------:|
+| <img width="160px" src="https://avatars.githubusercontent.com/yongbin97"/> | <img width="160px" src="https://avatars.githubusercontent.com/junseoplee"/> |
+|                 [yongbin97](https://github.com/yongbin97)                  |                 [junseoplee](https://github.com/junseoplee)                 |
+|                       **[post / tag / memo]** 도메인 개발                       |          **[auth / user / archive]** <br/> 도메인 개발, 소셜 로그인 및 인프라 구축          |
+## 🛠️ 기술 스택
+
+### 📦 Language & Framework
+
+![Java](https://img.shields.io/badge/java-007396?style=for-the-badge&logo=openjdk&logoColor=white)
+![JUnit5](https://img.shields.io/badge/junit5-25A162?style=for-the-badge&logo=JUnit5&logoColor=white)
+![Mockito](https://img.shields.io/badge/mockito-25A162?style=for-the-badge&logo=&logoColor=white)
+![Spring_Boot](https://img.shields.io/badge/spring_boot-6DB33F?style=for-the-badge&logo=springboot&logoColor=white)
+![Spring_Data_JPA](https://img.shields.io/badge/spring_data_jpa-6DB33F?style=for-the-badge&logo=spring&logoColor=white)
+
+![Spring_security](https://img.shields.io/badge/spring_security-6DB33F?style=for-the-badge&logo=springsecurity&logoColor=white)
+![JWT](https://img.shields.io/badge/jwt-000000?style=for-the-badge&logo=JSON%20web%20tokens&logoColor=white)
+![OAuth2.0](https://img.shields.io/badge/oauth2.0-000000?style=for-the-badge&logo=oauth&logoColor=white)
+
+![Spring_AI](https://img.shields.io/badge/spring_ai-6DB33F?style=for-the-badge&logo=spring&logoColor=white)
+![Swagger](https://img.shields.io/badge/swagger-85EA2D?style=for-the-badge&logo=swagger&logoColor=black)
+
+### 🛢️ Database
+
+![MySQL](https://img.shields.io/badge/mysql-4479A1?style=for-the-badge&logo=MySQL&logoColor=white)
+![Redis](https://img.shields.io/badge/redis-DC382D?style=for-the-badge&logo=Redis&logoColor=white)
+
+### ☁️ Infra
+
+![AWS_EC2](https://img.shields.io/badge/aws_ec2-FF9900.svg?style=for-the-badge&logo=amazonec2&logoColor=white)
+![AWS_RDS](https://img.shields.io/badge/aws_rds-527FFF.svg?style=for-the-badge&logo=amazonrds&logoColor=white)
+![AWS_S3](https://img.shields.io/badge/aws_s3-569A31.svg?style=for-the-badge&logo=amazons3&logoColor=white)
+![GitHub_Actions](https://img.shields.io/badge/github_actions-2088FF.svg?style=for-the-badge&logo=githubactions&logoColor=white)
+![Docker](https://img.shields.io/badge/docker-2496ED.svg?style=for-the-badge&logo=docker&logoColor=white)
+![Nginx](https://img.shields.io/badge/nginx-009639?style=for-the-badge&logo=nginx&logoColor=white)
+
+### 🌱 프로젝트 환경
+
+> - Java 17
+> - Spring Boot 3.3.3
+> - Gradle 8.8
+> - Git Flow [Feature &rarr; Develop &rarr; Main]
+
+<br>
+
+## ⚡ 협업 과정 - PR 및 코드 리뷰
+
+- [아카이브 API 구현 ](https://github.com/Someup/backend/pull/42)
+- [게시글 관련 API 고도화](https://github.com/Someup/backend/pull/31)
+- [로그아웃 구현](https://github.com/Someup/backend/pull/23)
+- [게시글 조회, 저장, 수정 API](https://github.com/Someup/backend/pull/17)
+
+<br>
+
+## 🏗️ Architecture
+
+<img width="1583" alt="someup_architecture" src="https://github.com/user-attachments/assets/525130f8-931e-4782-959a-dcae571741f3">
+
+<br>
+
+## 📐 ERD
+
+![someup](https://github.com/user-attachments/assets/85b80a48-c900-45be-a4bd-b95e5e3d7785)
+
+<br>