doc: use my legal name in README
Just so that it's documented. Feel free to call me anything you want though: Timothy, Tim, 顾天骋. Just not "Timmy." Or "Timbo." Please.
Checklist
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documentation is changed or added
Affected core subsystem(s)
doc
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data