translate: add examples
translate: add examples

Change-Id: I801712778e38c9b938ad5bbcbb765cddbd7911bd
Reviewed-on: https://code-review.googlesource.com/11658
Reviewed-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Chris Broadfoot <0c2851a4f8ab4aa5606e69c0757771dd13dbe686@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go