docs: update README.md and add testing documentation

docs/src/automated-testing.md

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+# Automated Testing
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+**Vutron** includes automated testing. The testing framework uses Microsoft's **[Playwright](https://playwright.dev)**.
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+**Playwright** is optimized for web application testing and has full support for the **Electron** framework. It is simple to install, requires no configuration to start testing immediately, and is cross-platform. You can learn more about **Playwright** here: https://github.com/microsoft/playwright
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+Only very simple launch and behavioral tests for the template main screen have been implemented in this template. Advanced testing will depend on the scope of your application.
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+Currently, the test specification file is located in the `tests` directory and the test results file is located in `tests/results`. (The built-in test specification file does not generate a separate results file.)
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+The Playwright configuration is `playwright.config.ts` in the project root, see the following documentation for more information on this: https://playwright.dev/docs/test-configuration