Added skill reference to quickstart docs (#309)

Author: vincent-derks

apps/docs/content/docs/frameworks/next/index.mdx

@@ -18,6 +18,12 @@ Install the Flags SDK using your preferred package manager:
 npm install flags
 ```
 
+If you use an AI coding assistant, we recommend installing the Flags SDK agent skill:
+
+```sh title="Terminal"
+npx skills add vercel/flags --skill flags-sdk
+```
+
 ## Declaring a feature flag
 
 Create a `flags.ts` file in your project and declare a feature flag there:

apps/docs/content/docs/frameworks/sveltekit/index.mdx

@@ -110,6 +110,12 @@ npm i -g vercel@latest
    npm i flags
    ```
 
+   If you use an AI coding assistant, we recommend installing the Flags SDK agent skill:
+
+   ```sh
+   npx skills add vercel/flags --skill flags-sdk
+   ```
+
 2. Create your first feature flag by importing the `flag` method from `flags/sveltekit`:
 
    ```ts title="src/lib/flags.ts"