Add first widget Preference for SPA

This also including a codelab app to show the demo.

Bug: 235727273
Test: android unit test
Ignore-AOSP-First: new library not in AOSP
Change-Id: Ib4d6e05c24ba10ca7749702524e3c64c114b1471
diff --git a/packages/SettingsLib/Spa/OWNERS b/packages/SettingsLib/Spa/OWNERS
new file mode 100644
index 0000000..b352b04
--- /dev/null
+++ b/packages/SettingsLib/Spa/OWNERS
@@ -0,0 +1,6 @@
+chaohuiw@google.com
+hanxu@google.com
+kellyz@google.com
+pierreqian@google.com
+
+per-file *.xml = set noparent