Add vitepress docs

docs/app/index.md

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+# @welshman/app
+
+A comprehensive framework for building nostr clients, powering production applications like [Coracle](https://coracle.social) and [Flotilla](https://flotilla.social). It provides a complete toolkit for managing events, subscriptions, user data, and relay connections.
+
+## What's Included
+
+- **Repository System** - Event storage and query capabilities
+- **Router** - Intelligent relay selection for optimal networking
+- **Feed Controller** - Manages feed creation and updates
+- **Authentication** - User identity and key management
+- **Event Actions** - High-level operations like reacting, replying, etc.
+- **Profile Management** - User profile handling and metadata
+- **Relay Directories** - Discovery and management of relays
+
+
+## Installation
+
+```bash
+npm install @welshman/app
+```