Proposed changes

This pull request adds the "wdio-multiremote-appium-chromedriver-boilerplate" project to our boilerplate documentation. The project is designed to demonstrate how to run WebdriverIO multi-remote tests using Appium and the Chromedriver service with the latest version of WebdriverIO. It leverages modern frameworks including WebdriverIO (v9), Appium (v2), and Mocha, while also incorporating advanced features such as the Page Object Model, TypeScript, and ESLint. The boilerplate supports both web and mobile testing, covering native Android and iOS apps, and includes practical test examples for logging in to the-internet.herokuapp.com and the WebdriverIO native demo app.

Types of changes

• Polish (an improvement for an existing feature)
• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (improvements to the project's docs)
• Specification changes (updates to WebDriver command specifications)
• Internal updates (everything related to internal scripts, governance documentation and CI files)

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Backport Request

• This change is solely for v9 and doesn't need to be back-ported
• Back-ported PR at #XXXXX

Reviewers: @webdriverio/project-committers