js: readme

modules/brk-client/README.md

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+# brk-client
+
+JavaScript/TypeScript client for the [Bitcoin Research Kit](https://github.com/bitcoinresearchkit/brk) API.
+
+[npm](https://www.npmjs.com/package/brk-client) | [API Reference](https://github.com/bitcoinresearchkit/brk/blob/main/modules/brk-client/docs/globals.md)
+
+## Installation
+
+```bash
+npm install brk-client
+```
+
+## Quick Start
+
+```javascript
+import { BrkClient } from 'brk-client';
+
+// Use the free public API or your own instance
+const client = new BrkClient('https://bitview.space');
+// or: `const client = new BrkClient({ baseUrl: 'https://bitview.space', timeout: 10000 });`
+
+// Blockchain data (mempool.space compatible)
+const block = await client.getBlockByHeight(800000);
+const tx = await client.getTx('abc123...');
+const address = await client.getAddress('bc1q...');
+
+// Metrics API - typed, chainable
+const prices = await client.metrics.price.usd.split.close
+  .by.dateindex
+  .last(30); // Last 30 items
+
+// Generic metric fetching
+const data = await client.getMetric('price_close', 'dateindex', -30);
+```