fix: add expo project example (#2251)

Co-authored-by: Jeff Ching <chingor@google.com>

README.md

@@ -191,7 +191,7 @@ Release Please automates releases for the following flavors of repositories:
 | `krm-blueprint`     | [A kpt package, with 1 or more KRM files and a CHANGELOG.md](https://github.com/GoogleCloudPlatform/blueprints/tree/main/catalog/project) |
 | `maven`             | [Strategy for Maven projects, generates SNAPSHOT version after each release and updates `pom.xml` automatically](docs/java.md) |
 | `node`              | [A Node.js repository, with a package.json and CHANGELOG.md](https://github.com/yargs/yargs) |
-| `expo`              | An Expo based React Native repository, with a package.json, app.json and CHANGELOG.md |
+| `expo`              | [An Expo based React Native repository, with a package.json, app.json and CHANGELOG.md](https://github.com/dmi3y/expo-release-please-example) |
 | `ocaml`             | [An OCaml repository, containing 1 or more opam or esy files and a CHANGELOG.md](https://github.com/grain-lang/binaryen.ml) |
 | `php`               | A repository with a composer.json and a CHANGELOG.md |
 | `python`            | [A Python repository, with a setup.py, setup.cfg, CHANGELOG.md](https://github.com/googleapis/python-storage) and optionally a pyproject.toml and a <project>/\_\_init\_\_.py |