Summary: Include a toy app we can reference in the blog

Test Plan: Manual

Reviewers: #stirling, yzhao

Reviewed By: #stirling, yzhao

Subscribers: yzhao

Differential Revision: https://phab.corp.pixielabs.ai/D8674

GitOrigin-RevId: c8d8e97f4e0471df392511db83d31596080ecb28