Add a simple prototype "terminal" example.

sky/examples/terminal/terminal_display.dart

Index: sky/examples/terminal/terminal_display.dart
diff --git a/sky/examples/terminal/terminal_display.dart b/sky/examples/terminal/terminal_display.dart
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+
+// Interface for a terminal display, able to accept bytes (from the computer)
+// and typically displaying them (or possibly handling them as escape codes,
+// etc.) and able to get bytes from the "user".
+abstract class TerminalDisplay {
+  void putChar(int byte);
+  Future<int> getChar();
+
+  // TODO(vtl): Should probably also have facilities for putting many bytes at a
+  // time or getting as many bytes as available.
+}