[Proposal] Add Probot example to Functions examples

[gr2m]

Hello friends 👋🏼

The Add a function example button on https://functions.netlify.com/examples/ brought me here.

I'm one of the @probot maintainers. Probot is a framework to build GitHub Apps. We created example repositories for the different Node app deployment targets out there, and I just created one for Netlify Functions: https://github.com/probot/example-netlify-functions

I thought you might be interested in adding it to the examples gallery?

It was the first time I deployed to Netlify functions, the setup was super smooth! But if there is anything I should mention in the README, or anything else I can do, please let me know