Pull request

Description

This PR fixes issues with android device running with Android < 26 using java8 features. For example when using feature from kotlinx-datetime.

It will throw a following error related to exception Didn't find class "java.time.Instant". https://developer.android.com/studio/write/java8-support#library-desugaring

             java.lang.NoClassDefFoundError: Failed resolution of: Ljava/time/Instant;
             	at kotlinx.datetime.Instant.<clinit>(Instant.kt:95)
             	at kotlinx.datetime.Clock$System.now(Clock.kt:54)
             	at ch.srg.sandbox.pillarbox.sandbox.MyApplication.onCreate(MyApplication.kt:24)
             	at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1024)
             	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5361)
             	at android.app.ActivityThread.-wrap2(ActivityThread.java)
             	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1528)
             	at android.os.Handler.dispatchMessage(Handler.java:102)
             	at android.os.Looper.loop(Looper.java:154)
             	at android.app.ActivityThread.main(ActivityThread.java:6077)
             	at java.lang.reflect.Method.invoke(Native Method)
             	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
             	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
             Caused by: java.lang.ClassNotFoundException: Didn't find class "java.time.Instant" on path:

Changes made

• Add jdk desugar library and corresponding configuration
• Update README

Checklist

• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).