feat: swagger config 작성

BE/error/src/main/java/com/example/demo/config/SwaggerConfig.java

@@ -0,0 +1,21 @@
+package com.example.demo.config;
+
+
+import io.swagger.v3.oas.models.Components;
+import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.oas.models.info.Info;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class SwaggerConfig {
+
+    @Bean
+    public OpenAPI openAPI() {
+        return new OpenAPI().components(new Components()).info(apiInfo());
+    }
+
+    private Info apiInfo() {
+        return new Info().title("ERROR API").description("ERROR Swagger").version("2.0.0");
+    }
+}