Add vitepress docs

docs/net/pool.md

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+# Pool
+
+The Pool class manages a collection of relay connections, providing a centralized way to track and reuse connections across your application.
+
+## Overview
+
+- Creates and caches connections
+- Ensures single connection per relay
+- Handles cleanup of unused connections
+- Provides connection lookup
+
+## Usage
+
+```typescript
+import {Pool} from '@welshman/net'
+
+// Create pool
+const pool = new Pool()
+
+// Get or create connection
+const connection = pool.get("wss://relay.example.com")
+
+// Check if relay is in pool
+if (pool.has("wss://relay.example.com")) {
+  // Use existing connection
+}
+
+// Remove connection
+pool.remove("wss://relay.example.com")
+
+// Clear all connections
+pool.clear()
+```
+
+
+The Pool is typically used internally by the router and executor, but can be used directly for custom connection management.
+It ensures efficient connection reuse across your application.