Added some migrations and Simple GUI

src/main/java/service/UserService.java

@@ -0,0 +1,32 @@
+package service;
+
+import models.User;
+
+import java.util.Optional;
+
+public class UserService {
+
+    public Optional<User> login(String username, String password) {
+        try {
+
+
+
+            return Optional.empty();
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+            return Optional.empty();
+        }
+    }
+
+    public Optional<User> register(String username, String password) {
+        try {
+
+
+            return Optional.empty();
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+            return Optional.empty();
+        }
+    }
+
+}