Add primitive rntuple_test.js script

Author: linev

demo/node/rntuple_test.js

@@ -0,0 +1,15 @@
+import { version, openFile } from 'jsroot';
+
+import { readHeaderFooter } from 'jsroot/rntuple';
+
+
+console.log(`JSROOT version ${version}`);
+
+
+let file = await openFile('https://jsroot.gsi.de/files/tmp/ntpl001_staff.root');
+let rntuple = await file.readObject('Staff');
+
+await readHeaderFooter(rntuple);
+
+console.log('some debug info', rntuple.builder?.name);
+