adds phoenix boilerplate and database api

- message communication added
- database migration added
- initial commit

test/bump_web/controllers/page_controller_test.exs

@@ -0,0 +1,8 @@
+defmodule BumpWeb.PageControllerTest do
+  use BumpWeb.ConnCase
+
+  test "GET /", %{conn: conn} do
+    conn = get(conn, "/")
+    assert html_response(conn, 200) =~ "Welcome to Phoenix!"
+  end
+end