Sync cli docs (#1387)

sync cli docs

Co-authored-by: svelte-docs-bot[bot] <196124396+svelte-docs-bot[bot]@users.noreply.github.com>

Author: github-actions[bot]

apps/svelte.dev/content/docs/cli/20-commands/20-sv-add.md

@@ -39,3 +39,4 @@ You can select multiple space-separated add-ons from [the list below](#Official-
 - [`sveltekit-adapter`](sveltekit-adapter)
 - [`tailwindcss`](tailwind)
 - [`vitest`](vitest)
+- [`devtools-json`](devtools-json)

apps/svelte.dev/content/docs/cli/30-add-ons/60-devtools-json.md

@@ -0,0 +1,22 @@
+---
+NOTE: do not edit this file, it is generated in apps/svelte.dev/scripts/sync-docs/index.ts
+title: devtools-json
+---
+
+`devtools-json` is essentially a vite plugin [vite-plugin-devtools-json](https://github.com/ChromeDevTools/vite-plugin-devtools-json/) for generating the Chrome DevTools project settings file on-the-fly in the devserver.
+
+It will prevent this server log:
+
+```sh
+Not found: /.well-known/appspecific/com.chrome.devtools.json
+```
+
+## Usage
+
+```bash
+npx sv add devtools-json
+```
+
+## What you get
+
+- the `vite` plugin added to your vite plugin options.