cryptoc: Add OWNERS file

This CL is populating OWNERS file based on the candidates in the Chrome OS OWNERS status sheet.

BUG=b:132095048
TEST=None

Change-Id: I22ed4b247e12a152e2ab795ebb742186a0b48df9
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..4e93ae6
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,3 @@
+mnissler@chromium.org
+jorgelo@chromium.org
+mschilder@google.com