ymotongpoo: add example program for Contributor's Workshop in GopherCon 2018

This program is just a dummy code as an example to experience Go contribute process.
The detailed process is documented in https://golang.org/s/gophercon2018.

Change-Id: I831dba407347ec2c88bf097c93dcf89b26605fc9
Reviewed-on: https://go-review.googlesource.com/132339
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/ymotongpoo/main.go b/ymotongpoo/main.go
new file mode 100644
index 0000000..ff28084
--- /dev/null
+++ b/ymotongpoo/main.go
@@ -0,0 +1,11 @@
+// Copyright 2018 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("this is a change!")
+}