Provide lambda function example to send email notification

[Fabien Udriot]

It may be out of scope of this project - and in this case just close the issue - but since I was digging how to send email notifications upon order I made this commit that I am reporting here. Code is not complete since it is not showing how axios should trigger the notification and should go something like that.

axios.post('/.netlify/functions/notify', {
    body: 'todo...'
  })
  .then(function (response) {
    console.log(response);
  })
  .catch(function (error) {
    console.log(error);
  });

I can not create a direct PR since I modified other stuffs that is related to the layout.

[Sarah Drasner]

Yeah, this is out of the scope of this project, I'm still trying to keep it a smaller project so that it's not hard for people to get going. Thanks!