add single files, secure server, hello world

single_file_tests/file.dart

@@ -0,0 +1,11 @@
+import 'dart:io';
+
+main() async {
+  var f = new File('f.txt');
+  var contents = await f.readAsString();
+  var lines = await f.readAsLines();
+
+  print('Contents:' + contents);
+  print('Lines:' + lines.join('||'));
+}
+