Added WebConfig file (for api)

src/main/java/com/example/demo/config/WebConfig.java

+package com.example.demo.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfig implements WebMvcConfigurer {
+
+    @Override
+    public void addCorsMappings(CorsRegistry registry) {
+        registry.addMapping("/api/**")
+                .allowedOrigins("*")  // Allow any origin - replace with specific origins in production
+                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
+                .allowedHeaders("*")
+                .maxAge(3600); // 1 hour cache for CORS preflight requests
+    }
+}
\ No newline at end of file