implement error and healthh endpoints

lib/provider_service_web/controllers/error_json.ex

@@ -0,0 +1,17 @@
+defmodule ProviderServiceWeb.ErrorJSON do
+  @moduledoc """
+  This module is invoked by your endpoint in case of errors on JSON requests.
+  """
+
+  def render("404.json", _assigns) do
+    %{errors: %{detail: "Not Found"}}
+  end
+
+  def render("500.json", _assigns) do
+    %{errors: %{detail: "Internal Server Error"}}
+  end
+
+  def render(template, _assigns) do
+    %{errors: %{detail: Phoenix.Controller.status_message_from_template(template)}}
+  end
+end

lib/provider_service_web/controllers/health_controller.ex

@@ -0,0 +1,15 @@
+defmodule ProviderServiceWeb.HealthController do
+  use ProviderServiceWeb, :controller
+
+  def health(conn, _params) do
+    conn
+    |> put_status(:ok)
+    |> json(%{status: "ok"})
+  end
+
+  def ready(conn, _params) do
+    conn
+    |> put_status(:ok)
+    |> json(%{status: "ready"})
+  end
+end