Update README templates to include snippet on next/font (#44088)

Updates the README templates for `create-next-app` to include
information on the addition of the `next/font` library.

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the
feature request has been accepted for implementation before opening a
PR.
- [ ] Related issues linked using `fixes #number`
- [ ]
[e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs)
tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm build && pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing
doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)

packages/create-next-app/templates/app/js/README-template.md

@@ -18,6 +18,8 @@ You can start editing the page by modifying `app/page.jsx`. The page auto-update
 
 The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
 
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
 ## Learn More
 
 To learn more about Next.js, take a look at the following resources:

packages/create-next-app/templates/app/ts/README-template.md

@@ -18,6 +18,8 @@ You can start editing the page by modifying `app/page.tsx`. The page auto-update
 
 The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
 
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
 ## Learn More
 
 To learn more about Next.js, take a look at the following resources:

packages/create-next-app/templates/default/js/README-template.md

@@ -18,6 +18,8 @@ You can start editing the page by modifying `pages/index.js`. The page auto-upda
 
 The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
 
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
 ## Learn More
 
 To learn more about Next.js, take a look at the following resources:

packages/create-next-app/templates/default/ts/README-template.md

@@ -18,6 +18,8 @@ You can start editing the page by modifying `pages/index.tsx`. The page auto-upd
 
 The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
 
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
 ## Learn More
 
 To learn more about Next.js, take a look at the following resources: