update. It was bad if I deleted the example, so I restored it.

Author: blacknon

examples/README.md

@@ -0,0 +1,4 @@
+NOTE
+===
+
+It is not actually an example because it is used for a github-job.

examples/version.rs

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+// Copyright (c) 2021 Blacknon. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
+fn main() {
+    println!("{}", env!("CARGO_PKG_VERSION"));
+}