add single files, secure server, hello world

single_file_tests/run_process.dart

@@ -0,0 +1,14 @@
+#!/usr/bin/env dart
+
+import 'dart:io';
+
+main() async {
+  // run
+  var results = await Process.run('ls', ['-l']);
+  print(results.stdout);
+
+  // start
+  var process = await Process.start('ls', ['-l']);
+  var exitCode = await process.exitCode;
+  print('exit code: $exitCode');
+}