Add a graphics owner for graphics.h.

Bug: N/A
Test: N/A
Change-Id: I91c07531ba8a2da0187b7411b9c11dc3191dcede
diff --git a/libsystem/OWNERS b/libsystem/OWNERS
new file mode 100644
index 0000000..aeb160c
--- /dev/null
+++ b/libsystem/OWNERS
@@ -0,0 +1,2 @@
+jessehall@google.com
+olv@google.com