fix: add staff entity (#48)

Co-authored-by: TakahashiNg <83152264+TakahashiNguyen@users.noreply.github.com>
Reviewed-on: #48

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

@@ -4,4 +4,5 @@ public class Role {
 
 	public static final String Customer = "customer";
 	public static final String Manager = "manager";
+	public static final String Staff = "Staff";
 }

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

@@ -1,5 +1,10 @@
 package com.drinkool.lib.dtos;
 
+import lombok.AllArgsConstructor;
+import lombok.NoArgsConstructor;
+
+@AllArgsConstructor
+@NoArgsConstructor
 public class Login {
 
 	public String phone;

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

@@ -1,5 +1,10 @@
 package com.drinkool.lib.dtos;
 
+import lombok.AllArgsConstructor;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor
+@AllArgsConstructor
 public class Signup {
 
 	public String name;