Add beginnings of new cr command

go/src/infra/tools/cr/lib/terminal/terminal_test.go

+// Copyright 2016 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.
+
+package terminal
+
+func ExamplePrint() {
+        Print("This is a string.")
+        Print("These are the numbers %d and %d.", 1, 2)
+        // Output:
+        // This is a string.
+        // These are the numbers 1 and 2.
+}
+
+func ExampleDebug() {
+        Debug("This will not be printed.")
+        ShowDebug = true
+        Debug("This will be printed.")
+        // Output:
+        // This will be printed.
+}