Update README to push swift-java as the recommended approach

Also, showcase the pure Swift example separately.

Author: finagolfin

README.md

@@ -1,14 +1,25 @@
 # Swift Android Examples
 
-This repository contains example applications that demonstrate how to use the [Swift SDK for Android](https://swift.org/install). Each example showcases different integration patterns for Swift on Android.
+This repository contains example applications that demonstrate how to use the
+[Swift SDK for Android](https://swift.org/install). Each example showcases different
+integration patterns for Swift on Android. It is highly recommended that you use
+the automated swift-java interop that generates bindings for you; the others are
+merely provided as examples for those who want to dig deeper and see the raw JNI,
+or not use Java at all.
 
 ## Available Examples
 
-Examples using [swift-java](https://github.com/swiftlang/swift-java) to generate necessary Swift/Java bridging:
-- **[hello-swift-java](hello-swift-java/)** - application that demonstrates how to call Swift code from an Android app with automatically generated Java wrappers and JNI code using [swift-java](https://github.com/swiftlang/swift-java).
+Examples using [swift-java](https://github.com/swiftlang/swift-java) to generate
+the necessary Swift/Java bridging:
+- **[hello-swift-java](hello-swift-java/)** - application that demonstrates how
+to call Swift code from an Android app with automatically generated Java wrappers
+and JNI code.
+
+An example of a purely native Swift app, which calls no Java APIs:
+- **[native-activity](native-activity/)** - complete native Android activity with
+OpenGL ES rendering written entirely in Swift.
 
 Examples using raw JNI, without generated bridging sources:
 - **[hello-swift-raw-jni](hello-swift-raw-jni/)** - basic Swift integration that calls a Swift function.
 - **[hello-swift-raw-jni-callback](hello-swift-raw-jni-callback/)** - demonstrates bidirectional communication with Swift timer callbacks updating Android UI.
 - **[hello-swift-raw-jni-library](hello-swift-raw-jni-library/)** - shows how to package Swift code as a reusable Android library component.
-- **[native-activity](native-activity/)** - complete native Android activity with OpenGL ES rendering written entirely in Swift.