Update reference to Android SDK. Add reference to play release to

README.

Author: jscott1989

README.md

@@ -10,6 +10,8 @@ Getting Started
 
 This sample uses the Gradle build system. To build this project, use the "gradlew assemble" command or use "Import Project" in Android Studio.
 
+This app can also be found [on the Play store](https://play.google.com/store/apps/details?id=com.afwsamples.testdpc).
+
 Provisioning
 ------------
 

app/build.gradle

@@ -11,13 +11,13 @@ ext {
 }
 
 android {
-    compileSdkVersion 'android-R'
+    compileSdkVersion 'android-30'
     buildToolsVersion "28.0.0"
 
     defaultConfig {
         applicationId "com.afwsamples.testdpc"
         minSdkVersion 21
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode versionMajor * 1000 + versionMinor * 100 + versionBuild
         versionName "${versionMajor}.${versionMinor}.${versionBuild}"
         multiDexEnabled true