[catapult] - Copy Telemetry's gsutilz over to third_party.

third_party/gsutil/README.md

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+# gsutil
+
+gsutil is a Python application that lets you access Google Cloud Storage from
+the command line. You can use gsutil to do a wide range of bucket and object
+management tasks, including:
+
+* Creating and deleting buckets.
+* Uploading, downloading, and deleting objects.
+* Listing buckets and objects.
+* Moving, copying, and renaming objects.
+* Editing object and bucket ACLs.
+
+## Installation
+
+For installation instructions, please see:
+
+https://developers.google.com/storage/docs/gsutil_install
+
+## Testing / Development
+
+The gsutil source code is available at https://github.com/GoogleCloudPlatform/gsutil
+
+For information on developing gsutil and instructions for running the gsutil
+test suite, run the "gsutil help dev" command. Instructions are also available
+online at:
+
+https://developers.google.com/storage/docs/gsutil/addlhelp/ContributingCodetogsutil
+
+## Help and Support
+
+Run the "gsutil help" command for a list of the built-in gsutil help topics.
+
+You can also browse the help pages online at:
+
+https://developers.google.com/storage/docs/gsutil
+
+For community support, visit:
+
+https://developers.google.com/storage/docs/resources-support#community
+