Docs: README.md 생성 (#146)

- 기술 스택 정리

Author: bagjuna

README.md

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+# 🌟 Dolfin - 외국인을 위한 똑똑한 전자지갑
+
+---
+
+## 👨‍💻 백엔드 팀원
+
+---
+
+<table>
+  <tr>
+    <td align="center" width="33%" style="padding:16px;">
+      <a href="https://github.com/ss7622">
+        <img src="https://github.com/ss7622.png?size=220"
+             width="140" alt="jonbum avatar"
+             style="border-radius:50%; display:block;"/>
+        <div style="font-size:16px; font-weight:700; margin-top:8px;">이준범</div>
+      </a>
+      <div style="font-size:14px; opacity:.8;">백엔드</div>
+    </td>
+   <td align="center" width="33%" style="padding:16px;">
+      <a href="https://github.com/khozan0120">
+        <img src="https://github.com/khozan0120.png?size=220"
+             width="140" alt="khozan avatar"
+             style="border-radius:50%; display:block;"/>
+        <div style="font-size:16px; font-weight:700; margin-top:8px;">김호진</div>
+      </a>
+      <div style="font-size:14px; opacity:.8;">백엔드</div>
+    </td>
+     <td align="center" width="33%" style="padding:16px;">
+      <a href="https://github.com/bagjuna">
+        <img src="https://github.com/bagjuna.png?size=220"
+             width="140" alt="juna avatar"
+             style="border-radius:50%; display:block;"/>
+        <div style="font-size:16px; font-weight:700; margin-top:8px;">박준아</div>
+      </a>
+      <div style="font-size:14px; opacity:.8;">백엔드</div>
+    </td>
+  </tr>
+</table>
+
+---
+
+## ⛏️ 기술 스택
+
+---
+
+### WAS
+<p align="left">
+    <img src="https://img.shields.io/badge/Apache%20Tomcat-F8DC75?style=for-the-badge&logo=apachetomcat&logoColor=black" alt="Apache Tomcat">
+</p>
+
+### Framework
+
+<p align="left">
+  <img src="https://img.shields.io/badge/Spring-6DB33F?style=for-the-badge&logo=spring&logoColor=white" alt="Spring">
+</p>
+
+### Message Queue
+
+<p align="left">
+  <img src="https://img.shields.io/badge/Apache%20Kafka-231F20?style=for-the-badge&logo=apache-kafka&logoColor=white" alt="Apache Kafka">
+</p>
+
+### Security
+
+<p align="left">
+    <img src="https://img.shields.io/badge/Spring%20Security-6DB33F?style=for-the-badge&logo=spring&logoColor=white" alt="Spring Security">
+    <img src="https://img.shields.io/badge/JWT-000000?style=for-the-badge&logo=jsonwebtokens&logoColor=white" alt="JWT">
+    <img src="https://img.shields.io/badge/AWS%20WAF-232F3E?style=for-the-badge&logo=amazonaws&logoColor=white" alt="AWS WAF">
+</p>
+
+### Library
+<p align="left">
+    <img src="https://img.shields.io/badge/Flyway-CC0200?style=for-the-badge&logo=flyway&logoColor=white" alt="Flyway"> 
+    <img src="https://img.shields.io/badge/Swagger-85EA2D?style=for-the-badge&logo=swagger&logoColor=black" alt="Swagger">
+    <img src="https://img.shields.io/badge/Firebase-FFCA28?style=for-the-badge&logo=firebase&logoColor=black" alt="Firebase">
+    <img src="https://img.shields.io/badge/Spring%20Batch-6DB33F?style=for-the-badge&logo=spring&logoColor=white" alt="Spring Batch">
+    <img src="https://img.shields.io/badge/Caffeine-6F4E37?style=for-the-badge&logo=buymeacoffee&logoColor=white" alt="Caffeine">
+</p>
+
+### Data Layer
+<p align="left">
+    <img src="https://img.shields.io/badge/Amazon%20ElastiCache-005E9C?style=for-the-badge&logo=amazonaws&logoColor=white" alt="Amazon ElastiCache">
+    <img src="https://img.shields.io/badge/Amazon%20S3-569A31?style=for-the-badge&logo=amazons3&logoColor=white" alt="Amazon S3">
+    <img src="https://img.shields.io/badge/Amazon%20RDS-527FFF?style=for-the-badge&logo=amazonaws&logoColor=white" alt="Amazon RDS">
+</p>
+
+### External API
+<p align="left">
+    <img src="https://img.shields.io/badge/OpenAI-412991?style=for-the-badge&logo=openai&logoColor=white" alt="OpenAI">
+    <img src="https://img.shields.io/badge/CoolSMS-0066CC?style=for-the-badge&logo=sms&logoColor=white" alt="CoolSMS">
+    <img src="https://img.shields.io/badge/CodeF%20API-FF6B35?style=for-the-badge&logo=api&logoColor=white" alt="CodeF API">
+</p>
+
+---
+
+### DNS
+![Route 53](https://img.shields.io/badge/Route%2053-FF9900.svg?style=for-the-badge&logo=amazonaws&logoColor=white)
+
+### Notification
+![AWS SNS](https://img.shields.io/badge/AWS%20SNS-FF9900.svg?style=for-the-badge&logo=amazonaws&logoColor=white)
+### High Availability
+
+![AWS ELB](https://img.shields.io/badge/AWS%20ELB-FF9900.svg?style=for-the-badge&logo=amazonaws&logoColor=white)
+![Auto Scaling](https://img.shields.io/badge/Auto%20Scaling-FF9900.svg?style=for-the-badge&logo=amazonaws&logoColor=white)
+
+### Load Testing
+
+![k6](https://img.shields.io/badge/k6-7D64FF.svg?style=for-the-badge&logo=k6&logoColor=white)
+
+### Compute & Egress
+
+![AWS Lambda](https://img.shields.io/badge/AWS%20Lambda-FF9900.svg?style=for-the-badge&logo=awslambda&logoColor=white)
+![AWS EC2](https://img.shields.io/badge/AWS%20EC2-FF9900.svg?style=for-the-badge&logo=amazonaws&logoColor=white)
+![NAT Gateway](https://img.shields.io/badge/NAT%20Gateway-FF9900.svg?style=for-the-badge&logo=amazonaws&logoColor=white)
+
+### Deployment Pipeline
+
+![Docker](https://img.shields.io/badge/Docker-1D63ED.svg?style=for-the-badge&logo=docker&logoColor=white)
+![GitHub Actions](https://img.shields.io/badge/GitHub%20Actions-2088FF.svg?style=for-the-badge&logo=githubactions&logoColor=white)
+![AWS Launch Template](https://img.shields.io/badge/AWS%20Launch%20Template-FF9900.svg?style=for-the-badge&logo=amazonaws&logoColor=white)