Update README.md

Author: yujeong430

README.md

@@ -6,9 +6,13 @@
 ## 2. Tech Stack
 <div>
 <img src="https://img.shields.io/badge/Java-007396?style=flat-square&logo=java&logoColor=white">
+<img src="https://img.shields.io/badge/Gradle-02303A?style=flat-square&logo=gradle&logoColor=white">
 <img src="https://img.shields.io/badge/Spring Boot-6DB33F?style=flat-square&logo=springboot&logoColor=white">
 <img src="https://img.shields.io/badge/Spring Data JPA-6DB33F?style=flat-square&logo=databricks&logoColor=white">
 <img src="https://img.shields.io/badge/Spring Security-6DB33F?style=flat-square&logo=springsecurity&logoColor=white">
+<img src="https://img.shields.io/badge/Jsoup-6DB33F?style=flat-square&logo=jsoup&logoColor=white">
+<img src="https://img.shields.io/badge/Firebase-DD2C00?style=flat-square&logo=firebase&logoColor=white">
+<img src="https://img.shields.io/badge/OAuth2.0-000000?style=flat-square&logoColor=white">
 </div>
 <div>
 <img src="https://img.shields.io/badge/MySQL-4479A1?style=flat-square&logo=mysql&logoColor=white">