Delete README as it causes issues with Doclava when trying to generate docs for Paging 3.0

BUG: 157899389
Test: ./gradlew bOS
Change-Id: I029b635421de958a9e89fb8ce6fb769577e53702
diff --git a/paging/common/src/main/kotlin/androidx/paging/multicast/README.md b/paging/common/src/main/kotlin/androidx/paging/multicast/README.md
deleted file mode 100644
index 0317847..0000000
--- a/paging/common/src/main/kotlin/androidx/paging/multicast/README.md
+++ /dev/null
@@ -1,2 +0,0 @@
-this is copied from dropbox/store.
-We should make this a real dependency when Store Multicast has proper keep alive behavior.
\ No newline at end of file