add license to README

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Jeff Epler 2021-10-25 08:21:33 -05:00
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commit 52895d8e97

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<!--
SPDX-FileCopyrightText: 2011 Jeff Epler
SPDX-License-Identifier: GPL-3.0-only
-->
I started this WWVB decoder in 2011, [talked about it on my
blog](https://emergent.unpythonic.net/01315859368) and then put it in a closet
for a decade.