Update README.md: added playwright batch

README.md

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 [![](https://tokei.rs/b1/github/XAMPPRocky/tokei)](https://github.com/karchjd/lavaangui).
 ![contributions](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)
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+![Playwright Tests](https://github.com/karchjd/lavaangui/actions/workflows/playwright-test.yaml/badge.svg
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 The `lavaangui` package provides a free, open-source graphical user interface for the [lavaan](https://lavaan.org/) package. The core feature is that models can be specified by drawing path diagrams and fitted models visualized via interactive path diagrams.