Toolbar Feature Flags SvelteKit example (#932)

### Description

Simple SvelteKit template that uses the [Vercel
Toolbar](https://vercel.com/docs/workflow-collaboration/vercel-toolbar)
and [Feature
Flags](https://vercel.com/docs/workflow-collaboration/feature-flags).

### Demo URL

https://toolbar-feature-flags-sveltekit.vercel.app/

### Type of Change

- [x] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [ ] Other (changes to the codebase, but not to examples)

### New Example Checklist

- [ ] 🛫 `npm run new-example` was used to create the example
- [x] 📚 The template wasn't used but I carefuly read the [Adding a new
example](https://github.com/vercel/examples#adding-a-new-example) steps
and implemented them in the example
- [x] 📱 Is it responsive? Are mobile and tablets considered?

toolbar/toolbar-feature-flags-sveltekit/.gitignore

@@ -0,0 +1,23 @@
+node_modules
+
+# Output
+.output
+.vercel
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
+
+.vercel

toolbar/toolbar-feature-flags-sveltekit/.npmrc

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+engine-strict=true

toolbar/toolbar-feature-flags-sveltekit/README.md

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+---
+name: Vercel Toolbar Feature Flags SvelteKit Starter
+slug: toolbar-feature-flags-sveltekit
+description: Simple SvelteKit template that uses the Vercel Toolbar and Feature Flags.
+framework: Svelte
+useCase: Starter
+css: None
+deployUrl: https://vercel.com/new/clone?repository-url=https://github.com/vercel/examples/tree/main/toolbar/toolbar-feature-flags-sveltekit&project-name=toolbar-feature-flags-sveltekit&repository-name=toolbar-feature-flags-sveltekit&env=FLAGS_SECRET
+demoUrl: https://toolbar-feature-flags-sveltekit.vercel.app/
+relatedTemplates:
+  - toolbar-launchdarkly
+  - toolbar-optimizely
+  - toolbar-split
+  - toolbar-statsig
+---
+
+# Vercel Toolbar Flags SvelteKit Starter
+
+Simple SvelteKit template that uses the [Vercel Toolbar](https://vercel.com/docs/workflow-collaboration/vercel-toolbar) and [Feature Flags](https://vercel.com/docs/workflow-collaboration/feature-flags).
+
+## Demo
+
+https://toolbar-feature-flags-sveltekit.vercel.app/
+
+## How to Use
+
+You can choose from one of the following two methods to use this repository:
+
+### One-Click Deploy
+
+Deploy the example using [Vercel](https://vercel.com?utm_source=github&utm_medium=readme&utm_campaign=vercel-examples)
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https://github.com/vercel/examples/tree/main/toolbar/toolbar-feature-flags-sveltekit&project-name=toolbar-feature-flags-sveltekit&repository-name=toolbar-feature-flags-sveltekit&env=FLAGS_SECRET)
+
+### Clone and Deploy
+
+Execute the following command to download the example into the `my-project` folder:
+
+```bash
+npx degit@latest https://github.com/vercel/examples/toolbar/toolbar-feature-flags-sveltekit my-project
+```
+
+After installing the dependencies using `pnpm install`, create a new project in your Vercel Dashboard. In your project's settings, create an environment variable called `FLAGS_SECRET`. The value must have a specific length (32 random bytes encoded in base64) to work as an encryption key. You can create one using node:
+
+```bash
+node -e "console.log(crypto.randomBytes(32).toString('base64url'))"
+```
+
+In your local environment, connect to your created project using `vercel link` and then pull your environment variables with `vercel env pull`.
+
+Next, run SvelteKit in development mode:
+
+```bash
+pnpm dev
+```
+
+Deploy it to the cloud with [Vercel](https://vercel.com/new?utm_source=github&utm_medium=readme&utm_campaign=vercel-examples) ([Documentation](https://vercel.com/docs/frameworks/sveltekit)).

toolbar/toolbar-feature-flags-sveltekit/package.json

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+{
+  "name": "toolbar-feature-flags-sveltekit",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "dev": "vite dev",
+    "build": "vite build",
+    "preview": "vite preview",
+    "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+    "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
+  },
+  "devDependencies": {
+    "@sveltejs/adapter-vercel": "^5.0.0",
+    "@sveltejs/kit": "^2.0.0",
+    "@sveltejs/vite-plugin-svelte": "^3.0.0",
+    "@vercel/toolbar": "^0.1.15",
+    "@vercel/flags": "2.6.0",
+    "svelte": "^4.2.7",
+    "svelte-check": "^3.6.0",
+    "tslib": "^2.4.1",
+    "typescript": "^5.0.0",
+    "vite": "^5.0.3"
+  },
+  "type": "module"
+}