Update README.md

Author: codergeek121

README.md

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 # Custom Elements with Rails
 
+[![Tests](https://github.com/codergeek121/custom_elements-rails/actions/workflows/ruby.yml/badge.svg?branch=main)](https://github.com/codergeek121/custom_elements-rails/actions/workflows/ruby.yml)
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 This gem provides a small js-helper, installation scripts and generators to use custom elements in conjunction with the `importmap-rails` gem.
 
 ## Usage