Add localhost:4200 for new Angular frontend.

src/main/java/app/mealsmadeeasy/api/MvcConfiguration.java

@@ -16,7 +16,7 @@ public class MvcConfiguration {
             public void addCorsMappings(CorsRegistry registry) {
                 registry.addMapping("/**")
                         .allowedMethods("GET", "POST", "PUT", "DELETE")
-                        .allowedOrigins("http://localhost:5173")
+                        .allowedOrigins("http://localhost:5173", "http://localhost:4200")
                         .allowCredentials(true);
             }