Add READMEs for backend folders

backend-spring/.gitignore

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-README.md
 .gradle
 build/
 !gradle/wrapper/gradle-wrapper.jar

backend-spring/README.md

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+# chulbong-kr
+
+> [!WARNING]
+> Work in progress...
+
+chulbong-kr 을 Spring Boot 3을 이용해 만드는 과정
+
+# TODO
+- [x] 프로젝트 기본 설정
+  - [x] Security 6
+  - [x] MySQL 연동
+  - [x] JPA 연동
+  - [x] Lombok 연동
+  - [ ] Swagger 연동
+  - [ ] JUnit 연동
+  - [ ] ElasticSearch 연동
+- [ ] controller
+  - [ ] marker
+    - [x] GET /markers
+  - [ ] user
+  - [ ] report
+  - [ ] comment
+  - [ ] ranking
+- [ ] service
+- [ ] repository
+- [ ] util
+- [ ] external APIs

backend/README.md

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+# chulbong-:kr:
+
+## Technologies and Frameworks
+
+Below is the list of technologies and frameworks used in the Chulbong-KR backend:
+
+- **Programming Language**: Go v1.22.3
+- **Web Framework**: Fiber v2
+- **Database**: MySQL 8
+- **Caching**: Dragonfly (Redis-compatible)
+- **Search Engine**: ZincSearch (Elasticsearch-compatible)
+- **Chatting**: gorilla Websocket
+
+## Dependency Management
+
+- **Dependency Injection**: The project utilizes [Uber Fx](https://github.com/uber-go/fx) for managing dependencies effectively, following best practices in modularity and maintainability.
+
+## Coding Conventions
+
+- **Standards Followed**:
+  - Google's Go programming language conventions
+  - Uber's Go style guide
+
+## Code Quality
+
+- **Linter Configuration**:
+  - See `revive.toml` for the linter settings used to ensure code quality and consistency across the project.