Add telemetry for TRAP caching

node_modules/get-folder-size/bin/get-folder-size

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+
+const getSize = require('../');
+const argv = require('gar')(process.argv.slice(2));
+const path = require('path');
+// --folder or -f or last argument passed
+const folder = argv.folder || argv.f || argv._[argv._.length - 1];
+
+if (!folder) {
+  console.error('missing folder argument');
+  console.error('\n  Usage:\n');
+  console.error('get-folder-size --folder=/home/alex/www');
+  process.exit(1);
+}
+
+const ignore = argv.ignore ? new RegExp(argv.ignore) : null;
+
+getSize(path.resolve(folder), ignore, (err, bytes) => {
+  if (err) { throw err; }
+
+  console.log((bytes / 1024 / 1024).toFixed(2) + ' Mb');
+});