Add vitepress docs

docs/util/index.md

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+# @welshman/util
+
+A comprehensive utility package for Nostr application development, providing essential tools and types for working with Nostr events, addresses, profiles, and more.
+
+## What's Included
+
+- **Event Management**: Create, validate, and process Nostr events
+- **Repository**: In-memory event storage with querying and indexing
+- **Filters**: Advanced event filtering and subscription management
+- **Profiles**: User profile handling and formatting
+- **Lists**: Public and private list management
+- **Zaps**: Lightning Network payment integration
+- **Tags**: Comprehensive tag parsing and manipulation
+- **Addresses**: NIP-19 address handling
+- **Relays**: Relay URL handling, event dispatching and in-memory storage
+
+## Installation
+
+```
+npm install @welshman/util
+```