Assignment 3 apis for ecommerce web

[pratikpjain]

Completed assignment-3 for implementing api's for a e-commerce back-end

Features:

1. Add user
2. Update user
3. Get User/Users
4. Delete User
5. Add Order
6. Get Order/Orders
7. Update Order
8. Delete Order

API's Implemented:

r.HandleFunc("/user/{username}", user_service.GetUserByUserName).Methods("GET")
r.HandleFunc("/user", user_service.AddNewUser).Methods("POST")
r.HandleFunc("/user", user_service.UpdateUser).Methods("PUT")
r.HandleFunc("/user/{username}", user_service.DeleteUser).Methods("DELETE")
r.HandleFunc("/user/{username}/order", user_service.CreateNewOrderByUserName).Methods("POST")
r.HandleFunc("/user/{username}/orders", user_service.GetAllOrdersByUserName).Methods("GET")
r.HandleFunc("/user/{username}/order/{orderid}", user_service.GetOrderByUserNameOrderID).Methods("GET")
r.HandleFunc("/user/{username}/order", user_service.UpdateOrderByUserName).Methods("PUT")
r.HandleFunc("/user/{username}/order/{orderid}", user_service.DeleteOrderByUserName).Methods("DELETE")

User service is only exposed and order service is being called internally by user service.
1:n mapping is there between user and order relation.
Dockerized the application