add simple readme, introduce native SDK also

Author: Keillion

1.hello-world/14.read-video-webview/android/RADME.md

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+# Hello-world for Android WebView - Dynamsoft Barcode Reader Sample
+
+This sample demonstrates how to use the [Dynamsoft Barcode Reader](https://www.dynamsoft.com/barcode-reader/overview/) JS Edition in Android.
+
+If you want to learn how to use the Android Edition SDK in javascript, you can check [Android WebView Barcode Scanning](https://github.com/Dynamsoft/barcode-reader-mobile-samples/tree/main/android/JavaScript/WebViewBarcodeScanning).

1.hello-world/14.read-video-webview/android/app/src/androidTest/java/com/dynamsoft/dbrjswebview/ExampleInstrumentedTest.kt

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+# Hello-world for iOS WKWebView - Dynamsoft Barcode Reader Sample
+
+This sample demonstrates how to use the [Dynamsoft Barcode Reader](https://www.dynamsoft.com/barcode-reader/overview/) JS Edition in iOS(Swift).
+
+If you want to learn how to use the Android Edition SDK in javascript, you can check [iOS WebView Barcode Scanning](https://github.com/Dynamsoft/barcode-reader-mobile-samples/tree/main/ios/JavaScript/WebViewBarcodeScanning).