Fix missing attributions to come into compliance with the Apache license

[acockrell]

You've copied some work from Minitap's mobile-use yet you've explicitly dropped the attributions required by the Apache license.

This PR fixes that for you.

More context.

[google-cla]

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[KorvinSzanto]

Better sign the contributor license agreement, you wouldn't want any confusion about code ownership!

Google loves it when you grant them copyright but apparently couldn't care less about anyone else's copyright.

[acockrell]

Better sign the contributor license agreement, you wouldn't want any confusion about code ownership!

I've already signed the CLA and re-run the check.

[mkitti]

This pull request importantly adds a NOTICE file which is an explicit requirement of the Apache License 2.0.

371aa6d on the main branch added some attribution but it does not add a NOTICE file with the prior content as per Section 4d of the Apache License 2.0:

If the Work includes a "NOTICE" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License.

[racedale]

@somew1nd