Add framework for basic cr command

go/src/infra/tools/cr/main.go

Index: go/src/infra/tools/cr/main.go
diff --git a/go/src/infra/tools/cr/main.go b/go/src/infra/tools/cr/main.go
new file mode 100644
index 0000000000000000000000000000000000000000..7938ef9723998667b67b5579f43f61947fabff40
--- /dev/null
+++ b/go/src/infra/tools/cr/main.go
@@ -0,0 +1,16 @@
+// 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.
+
+/*
+Core of the Chrome Infrastructure CLI SDK. Provides autoupdate, module
+discovery, module installation, and help.
+*/
+
+package main
+
+import "infra/tools/cr/cmd"
+
+func main() {
+	cmd.Execute()
+}