Add example API request approach

[sawyerh]

We could add an API request example to the template so that teams have an example approach and file structure from the start. Nava has a frontend interview exercise that includes mock API endpoint(s) that we could utilize, or we could create a different environment specifically for the template to hit.

🔒 Related convo: https://nava.slack.com/archives/C03G1SWD9H7/p1676655469755159

This has some overlap with #236