bdowns: add bdowns/main.go for GopherCon

Change-Id: I8552363d935bed38e7c08d6ef5c144bcbd721152
Reviewed-on: https://go-review.googlesource.com/48779
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

bdowns/main.go

diff --git a/bdowns/main.go b/bdowns/main.go
new file mode 100644
index 0000000..dbc6518
--- /dev/null
+++ b/bdowns/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("😊")
+}