mennis: : add main.go for GopherCon:

Change-Id: I0798ec637140088bd94bff77c352ecf0033dfa56
Reviewed-on: https://go-review.googlesource.com/48984
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/mennis/main.go b/mennis/main.go
new file mode 100644
index 0000000..bf2cbba
--- /dev/null
+++ b/mennis/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("Happy to be at gophercon!")
+}