libsparse: add OWNERS.

Bug: N/A
Test: N/A
Change-Id: Ie26da2ff47de4cef20050b996a04d53c2b5c358f
diff --git a/libsparse/OWNERS b/libsparse/OWNERS
new file mode 100644
index 0000000..70b375f
--- /dev/null
+++ b/libsparse/OWNERS
@@ -0,0 +1 @@
+ccross@google.com