Add User model.

lib/link_shortener_web/views/api/v1/user_view.ex

@@ -0,0 +1,20 @@
+defmodule LinkShortenerWeb.Api.V1.UserView do
+  use LinkShortenerWeb, :view
+  alias LinkShortenerWeb.UserView
+
+  def render("index.json", %{users: users}) do
+    %{data: render_many(users, UserView, "user.json")}
+  end
+
+  def render("show.json", %{user: user}) do
+    %{data: render_one(user, UserView, "user.json")}
+  end
+
+  def render("user.json", %{user: user}) do
+    %{
+      id: user.id,
+      email: user.email,
+      encrypted_password: user.encrypted_password
+    }
+  end
+end