Update README with info about SQL example

Author: calvinmclean

README.md

@@ -145,8 +145,9 @@ api.SetStorage(storage.NewClient[*TODO](db, "TODO"))
 | [Storage](./examples/storage/)                     | The example shows how to use the `babyapi/storage` package to implement persistent storage                                                                                                                                      | <ul><li>Use `SetStorage` to use a custom storage implementation</li><li>Create a `hord` storage client using `babyapi/storage`</li></ul>                                                                                                                                                                                                                                          |
 | [TODO list with HTMX UI](./examples/todo-htmx/)    | This is a more complex example that demonstrates an application with HTMX frontend. It uses server-sent events to automatically update with newly-created items                                                                 | <ul><li>Implement `babyapi.HTMLer` for HTML responses</li><li>Set custom HTTP response codes per HTTP method</li><li>Use built-in helpers for handling server-sent events on a custom route</li><li>Use `SetOnCreateOrUpdate` to do additional actions on create</li><li>Handle HTML forms as input instead of JSON (which works automatically and required no changes)</li></ul> |
 | [Event RSVP](./examples/event-rsvp/)               | This is a more complex nested example that implements basic authentication, middlewares, and relationships between nested types. The app can be used to create `Events` and provide guests with a link to view details and RSVP | <ul><li>Demonstrates middlewares and nested resource relationships</li><li>Authentication</li><li>Custom non-CRUD endpoints</li><li>More complex HTML templating</li></ul>                                                                                                                                                                                                        |
-| [Multiple APIs](./examples/multiple-apis/)         | This example shows how multiple top-level (or any level) sibling APIs can be served, and have CLI functionality, under one root API                                                                                             | <ul><li>Use `NewRootAPI` to create a root API</li><li>Add multiple children to create siblings</li>                                                                                                                                                                                                                                                                               |
-| [Background Worker](./examples/background-worker/) | This example shows how you can use `babyapi` in an application alongside background workers and have runtime control over all goroutines                                                                                        | <ul><li>Use `WithContext` to add a context to an API so the API will stop when the context is cancelled</li><li>Use `api.Done()` to have other goroutines stop when the API is stopped</li>                                                                                                                                                                                       |
+| [Multiple APIs](./examples/multiple-apis/)         | This example shows how multiple top-level (or any level) sibling APIs can be served, and have CLI functionality, under one root API                                                                                             | <ul><li>Use `NewRootAPI` to create a root API</li><li>Add multiple children to create siblings</li></ul>                                                                                                                                                                                                                                                                          |
+| [Background Worker](./examples/background-worker/) | This example shows how you can use `babyapi` in an application alongside background workers and have runtime control over all goroutines                                                                                        | <ul><li>Use `WithContext` to add a context to an API so the API will stop when the context is cancelled</li><li>Use `api.Done()` to have other goroutines stop when the API is stopped</li></ul>                                                                                                                                                                                  |
+| [sql](./examples/sql/)                             | This example shows how you can build an API with a custom implementation of `babyapi.Storage` using [`sqlc`](https://sqlc.dev)                                                                                                  | <ul><li>Implement an Extension using a custom implementation of `babyapi.Storage`</li><li>Use `api.Done()` to clean up DB resources<li><li>Extend the built-in CLI to add flags or other customizations<li></ul>                                                                                                                                                                  |
 
 Also see a full example of an application implementing a REST API using `babyapi` in my [`automated-garden` project](https://github.com/calvinmclean/automated-garden/tree/main/garden-app).