Add informative samples README.md

Also updates stale documentation with informative links.
diff --git a/samples/storage/README.md b/samples/storage/README.md
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+# Where are the samples?
+
+The Google Cloud Storage API samples are now hosted separately
+from the client library project. You can find them
+[here](https://github.com/GoogleCloudPlatform/storage-file-transfer-json-python).
+