Merge pull request #130 from alabiaga/bubbles-readme

Add bubbles readme file

BubblesKotlin/README.md

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+
+Android Bubbles Sample
+===================================
+
+Bubbles are built into the Notification system. They float on top of other app content and follow the user wherever they go. Bubbles can be expanded to reveal app functionality and information, and can be collapsed when not being used.
+
+This example showcases bubbles that can be surfaced by a chat app. For more information on bubbles, see the [Bubbles][1] developer guide.
+
+[1]: https://developer.android.com/guide/topics/ui/bubbles
+
+Pre-requisites
+--------------
+
+- Android SDK 29
+- Android Build Tools v28.0.3
+- Android Support Repository
+
+Screenshots
+-------------
+
+<img src="screenshots/bubble.png" height="400" alt="Screenshot"/> 
+
+Getting Started
+---------------
+
+This sample uses the Gradle build system. To build this project, use the
+"gradlew build" command or use "Import Project" in Android Studio.
+
+Support
+-------
+
+- Stack Overflow: http://stackoverflow.com/questions/tagged/android
+
+If you've found an error in this sample, please file an issue:
+https://github.com/android/user-interface
+
+Patches are encouraged, and may be submitted by forking this project and
+submitting a pull request through GitHub. Please see CONTRIBUTING.md for more details.
+