Adding websocket.

examples/websocket.ts

@@ -0,0 +1,26 @@
+import { websocket } from '../src/index';
+
+const init = async () => {
+  const ws = await websocket.init({
+    options: ['blocks', 'stats', 'mempool-blocks', 'live-2h-chart'],
+  });
+
+  ws.on('message', function incoming(data: any) {
+    const res = JSON.parse(data);
+    if (res.blocks) {
+      res.blocks.forEach((block: any) => {
+        console.log(block.height);
+      });
+    }
+    if (res.mempoolInfo) {
+      console.log(res.mempoolInfo);
+    }
+    if (res.transactions) {
+      console.log(res.transactions);
+    }
+    if (res.mempoolBlocks) {
+      console.log(res.mempoolBlocks);
+    }
+  });
+};
+init();