Sample app for datastore. This will be linked in the DataStore readme.

There are a lot of files here that were generated by android studio when creating the activity. My changes are in settings.proto, build.gradle and MainActivity.kt

Test: tested on my pixel 3
Bug: 157174209
Change-Id: Ic71f1448a75b103b427ae1e92a855c67c4ac47e2
diff --git a/settings.gradle b/settings.gradle
index a51cfa4..de7c1e69 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -138,6 +138,7 @@
 includeProject(":datastore:datastore-core", "datastore/datastore-core")
 includeProject(":datastore:datastore-preferences", "datastore/datastore-preferences")
 includeProject(":datastore:datastore-proto", "datastore/datastore-proto")
+includeProject(":datastore:datastore-sampleapp", "datastore/datastore-sampleapp")
 includeProject(":documentfile:documentfile", "documentfile/documentfile")
 includeProject(":drawerlayout:drawerlayout", "drawerlayout/drawerlayout")
 includeProject(":dynamicanimation:dynamicanimation", "dynamic-animation/dynamic-animation")