Update README.md

Added test badge

Author: kojix2

README.md

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 # Red Remote Input
 
+[![Test](https://github.com/red-data-tools/red-remote-input/actions/workflows/test.yml/badge.svg)](https://github.com/red-data-tools/red-remote-input/actions/workflows/test.yml)
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 Red Remote Input is a Ruby library designed to manage data download, cache, and extraction from specific URLs.
 Useful when you need to consistently retrieve, cache, and process data files from the Internet.