light: add a main

Change-Id: I5c1f7bef3c605a7edb8ce0d73706167c56ab954e
Reviewed-on: https://go-review.googlesource.com/48985
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/light/main.go b/light/main.go
new file mode 100644
index 0000000..7430b37
--- /dev/null
+++ b/light/main.go
@@ -0,0 +1,12 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The light program prints an encouraging Go mantra.
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Watch me go func()")
+}