Build a Go example app using Encore + OAuth

[bih]

We'd love to see a new Encore application template using Go, Encore, and OAuth. To create a new Encore application, run brew install encoredev/tap/encore (see the Install Guide) and then run encore auth login and encore app create to build a new application.

When building the application, feel free to either submit it as a directory within this repository or create a new repository.

Additional tasks

For extra bonus points: we'd love to see you submit a walkthrough video, or a tutorial.