feat(deleteUser): add delete user by id endpoint

Author: MayuriXx

src/main/java/com/xpeho/spring_boot_java_random_user/SpringBootJavaRandomUserApplication.java

@@ -7,6 +7,9 @@
 @SpringBootApplication
 public class SpringBootJavaRandomUserApplication {
 
+    private SpringBootJavaRandomUserApplication() {
+    }
+
     static void main(String[] args) {
         Dotenv.configure()
                 .ignoreIfMissing()