ci: add action-badge (apache#907)

Author: erisu

README.md

@@ -24,6 +24,8 @@ description: Open an in-app browser window.
 
 # cordova-plugin-inappbrowser
 
+[![Android Testsuite](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/android.yml/badge.svg)](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/android.yml) [![Chrome Testsuite](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/chrome.yml/badge.svg)](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/chrome.yml) [![iOS Testsuite](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/ios.yml/badge.svg)](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/ios.yml) [![Lint Test](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/lint.yml/badge.svg)](https://github.com/apache/cordova-plugin-inappbrowser/actions/workflows/lint.yml)
+
 You can show helpful articles, videos, and web resources inside of your app. Users can view web pages without leaving your app.
 
 > To get a few ideas, check out the [sample](#sample) at the bottom of this page or go straight to the [reference](#reference) content.