Add auth templates

lib/nulla_web/controllers/auth_controller.ex

@@ -1,12 +1,37 @@
 defmodule NullaWeb.AuthController do
   use NullaWeb, :controller
+  alias Nulla.Models.User
 
-  def sign_in do
+  def sign_in_view(conn, _params) do
+    render(conn, :sign_in, layout: false)
   end
 
-  def sign_out do
+  def sign_in(conn, _params) do
+    conn
+    |> redirect(to: "/")
   end
 
-  def sign_up do
+  def sign_out(conn, _params) do
+    conn
+    |> configure_session(drop: true)
+    |> put_flash(:info, "You have been logged out.")
+    |> redirect(to: "/")
+  end
+
+  def sign_up_view(conn, _params) do
+    render(conn, :sign_up, layout: false)
+  end
+
+  def sign_up(conn, params) do
+    case User.create_user(params) do
+      {:ok, user} ->
+        conn
+        |> put_session(:user_id, user.id)
+        |> put_flash(:info, "You're registred!")
+        |> redirect(to: "/")
+
+      {:error, %Ecto.Changeset{} = changeset} ->
+        render(conn, "sign_up.html", changeset: changeset)
+    end
   end
 end