vanesa: add main.go for GopherCon

Change-Id: I1d269529aae8eee5f2d49d8a561e1333396dd2ea
Reviewed-on: https://go-review.googlesource.com/48758
Reviewed-by: Jaana Burcu Dogan <jbd@google.com>

vanesa/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("GopherCon 2017 is awesome.")
+}