Add vitepress docs

docs/lib/index.md

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+# @welshman/lib
+
+A lightweight TypeScript utility library with zero dependencies, providing essential tools for modern JavaScript development.
+
+## What's Included
+
+- **Deferred Promises** - Create promises with exposed resolve/reject methods
+- **LRU Cache** - Efficient caching with automatic eviction policies
+- **Utility Functions** - Helpers for arrays, objects, strings, and more
+- **Worker Queue** - Process tasks asynchronously with batching and throttling
+
+
+## Installation
+
+```bash
+npm install @welshman/lib
+```