fix: add cart service (#46)

Co-authored-by: TakahashiNg <83152264+TakahashiNguyen@users.noreply.github.com>
Reviewed-on: #46

lib/src/main/java/com/drinkool/Url.java

@@ -9,5 +9,6 @@ public class Url {
 	public static final String SmsOtp = "/sms_otp";
 	public static final String Me = "/me";
 	public static final String Logout = "/logout";
+	public static final String Cart = "/cart";
 	public static final String Review = "/review";
 }

lib/src/main/java/com/drinkool/lib/dtos/CartItemRequest.java

@@ -0,0 +1,9 @@
+package com.drinkool.lib.dtos;
+
+import java.util.UUID;
+
+public class CartItemRequest {
+
+	public UUID menuItemId;
+	public int quantity;
+}