RxDataStore.kt, the RxJava wrapper for the core API.

Future cls: 1) RxDataBuilder 2) RxDataMigration

Test: RxDataStoreTest.java
Relnote: There is now a RxJava Wrapper for the core DataStore API. Future updates will include a Builder and RxDataMigrations.
Bug: 170311106
Change-Id: I3e7e099488035cca906b5f6e6de0a387acb5b964

diff --git a/settings.gradle b/settings.gradle
index d21b5db..e33dbcce 100644
--- a/settings.gradle
+++ b/settings.gradle

@@ -282,6 +282,7 @@
 includeProject(":datastore:datastore-preferences-core:datastore-preferences-proto",
         "datastore/datastore-preferences-core/datastore-preferences-proto", [BuildType.MAIN])
 includeProject(":datastore:datastore-proto", "datastore/datastore-proto", [BuildType.MAIN])
+includeProject(":datastore:datastore-rxjava2", "datastore/datastore-rxjava2", [BuildType.MAIN])
 includeProject(":datastore:datastore-sampleapp", "datastore/datastore-sampleapp", [BuildType.MAIN])
 includeProject(":documentfile:documentfile", "documentfile/documentfile", [BuildType.MAIN])
 includeProject(":drawerlayout:drawerlayout", "drawerlayout/drawerlayout", [BuildType.MAIN])