Instagram backend api using go

You are required to Design and Develop an HTTP JSON API capable of the following operations,
Create an User
Should be a POST request
Use JSON request body
URL should be ‘/users'
Get a user using id
Should be a GET request
Id should be in the url parameter
URL should be ‘/users/<id here>’
Create a Post
Should be a POST request
Use JSON request body
URL should be ‘/posts'
Get a post using id
Should be a GET request
Id should be in the url parameter
URL should be ‘/posts/<id here>’
List all posts of a user
Should be a GET request
URL should be ‘/posts/users/<Id here>'
The API should be developed using Go.
MongoDB should be used for storage.
Only packages/libraries listed here and here can be used.