Add meta tag to default app template (#42394)

x-ref: [slack
thread](https://vercel.slack.com/archives/C03KAR5DCKC/p1667452501488239)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see `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`
- [ ] Integration 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`

## 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/app/head.jsx

@@ -2,6 +2,7 @@ export default function Head() {
   return (
     <>
       <title>Create Next App</title>
+      <meta content="width=device-width, initial-scale=1" name="viewport" />
       <meta name="description" content="Generated by create next app" />
       <link rel="icon" href="/favicon.ico" />
     </>

packages/create-next-app/templates/app/ts/app/head.tsx

@@ -2,6 +2,7 @@ export default function Head() {
   return (
     <>
       <title>Create Next App</title>
+      <meta content="width=device-width, initial-scale=1" name="viewport" />
       <meta name="description" content="Generated by create next app" />
       <link rel="icon" href="/favicon.ico" />
     </>