Add Courier Gatsby Netlify Form Starter

src/site/template/courier-gatsby-netlify-form-starter.md

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+---
+title: Courier Gatsby Netlify Form Starter
+repo: https://github.com/trycourier/gatsby-netlify-form-starter
+preview: courier-gatsby-netlify-form-starter.png
+example: https://courier-gatsby-netlify-form-starter.netlify.app/
+tags:
+  - gatsby
+  - courier
+  - form
+  - notifications
+  - functions
+---
+
+This is an example starter app that is showcasing how to build a form in
+[Gatsby](https://gatsbyjs.com), host it on [Netlify](https://www.netlify.com/) and use
+[Netlify functions](https://www.netlify.com/products/functions/) to send a notification using
+[Courier](https://www.courier.com/) on every form submit.