Add the API to create the Links model.

lib/link_shortener_web/controllers/api/v1/links_controller.ex

@@ -10,6 +10,15 @@ defmodule LinkShortenerWeb.Api.V1.LinksController do
     render(conn, "index.json", links: links)
   end
 
+  def create(conn, %{"link" => link_params}) do
+    with {:ok, %Links{} = link} <- Links.insert_one(link_params) do
+      conn
+      |> put_status(:created)
+      |> put_resp_header("location", Routes.links_path(conn, :show, link))
+      |> render("show.json", links: link)
+    end
+  end
+
   def show(conn, %{"id" => id}) do
     link = Links.get_one(id)
     render(conn, "show.json", links: link)