Cors recovery (#95)

* feat: cors 해결을 위한 OriginPattern 추가

* fix: OriginPattern 변경

* chore: 주석 추가

* feat: @EnableWebMvc 추가

* chore: 삭제 예정

* feat: CorsConfig 추가

be/issue-tracker/src/main/java/com/issuetracker/CorsConfig.java

@@ -0,0 +1,22 @@
+package com.issuetracker;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
+import org.springframework.web.filter.CorsFilter;
+
+@Configuration
+public class CorsConfig {
+    @Bean
+    public CorsFilter corsFilter() {
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        CorsConfiguration config = new CorsConfiguration();
+        config.setAllowCredentials(true);
+        config.addAllowedOrigin("*");
+        config.addAllowedHeader("*");
+        config.addAllowedMethod("*");
+        source.registerCorsConfiguration("/**", config);
+        return new CorsFilter(source);
+    }
+}