Add App Store marketing content and screenshots

Prepare App Store Connect content for the Cache Status Safari
extension. Includes:
- App description
- Feature highlights
- Supported CDN list
- Privacy statement
- Keywords
- Review notes
- Screenshots in light and dark modes

This enables submission to the App Store and provides clear,
concise information for potential users.

Author: bartTC

assets/app_store.md

@@ -0,0 +1,80 @@
+# App Store Content
+
+Copy-paste content for App Store Connect.
+
+---
+
+## App Information
+
+**Name:** Cache Status
+
+**Subtitle:** CDN cache status for Safari
+
+---
+
+## Description
+
+```
+Instantly see if a webpage is served from CDN cache or fetched from the origin server. Cache Status displays a badge in Safari's toolbar showing HIT, MISS, or other cache states at a glance.
+
+Perfect for web developers, DevOps engineers, and anyone who wants to understand how CDNs serve their content.
+
+FEATURES
+
+• Toolbar badge with cache status (HIT/MISS) for every page
+• Detailed popup with cache headers and response metadata
+• Performance metrics: TTFB, DNS, TLS, download time, transfer size
+• Edge location mapping – see which CDN POP served your request
+• Dark mode support
+
+SUPPORTED CDNs
+
+• Cloudflare
+• Amazon CloudFront
+• Fastly
+• Akamai
+• Bunny CDN
+• Varnish
+• Any CDN using standard x-cache headers
+
+PRIVACY FIRST
+
+Cache Status processes everything locally in your browser. No data is collected, stored, or transmitted.
+```
+
+---
+
+## Keywords
+
+```
+cdn,cache,cloudflare,cloudfront,fastly,akamai,developer,webdev,headers,performance,safari
+```
+
+---
+
+## What's New
+
+Copy from `RELEASE_NOTES.md` for the current version.
+
+---
+
+## App Review Notes
+
+```
+This is a Safari Web Extension for developers. It displays HTTP cache headers
+(like x-cache, cf-cache-status) in a popup when clicking the toolbar icon.
+
+To test:
+1. Enable the extension in Safari → Settings → Extensions
+2. Visit any website using a CDN (e.g., cloudflare.com, github.com)
+3. Click the Cache Status icon in the toolbar
+4. The popup shows cache status and headers
+
+No account or login required.
+```
+
+---
+
+## Screenshots
+
+*(Add screenshot files here)*