Update readme.md

Adding "License GPLv2" shield.io badge to the repo readme.md.
Weather-Station-Software · Aug 8, 2023 · 7c5a612 · 7c5a612
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 [![New WordPress.org release](https://github.com/Weather-Station-Software/live-weather-station/actions/workflows/deploy-new-release.yml/badge.svg)](https://github.com/Weather-Station-Software/live-weather-station/actions/workflows/deploy-new-release.yml)
+[![License: GPLv2](https://img.shields.io/badge/License-GPL_v2-blue.svg)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
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 # Weather Station
 - Contributors: jaz_on