calvn: add main.go for Gophercon

Change-Id: I65e183ac49cb4544a2fcffefe7670583c0f43e6b
Reviewed-on: https://go-review.googlesource.com/48774
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/calvn/main.go b/calvn/main.go
new file mode 100644
index 0000000..4ff57e7
--- /dev/null
+++ b/calvn/main.go
@@ -0,0 +1,11 @@
+// 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.
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello go!")
+}