Add vitepress docs

docs/net/index.md

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+# @welshman/net
+
+Core networking layer for nostr applications, handling relay connections, message management, and event delivery.
+
+## What's Included
+
+- **Connection Management** - WebSocket lifecycle and relay connections
+- **Subscription System** - Event filtering and subscription handling
+- **Publishing Tools** - Event broadcasting with status tracking
+- **Sync Utilities** - NIP-77 (negentropy) event synchronization
+- **Connection Pool** - Shared relay connection management
+- **Targets** - Flexible message routing strategies
+- **Event Tracking** - Monitor which relays have seen events
+
+## Installation
+
+```bash
+npm install @welshman/net
+```