Add a new directory for HostStubGen/Ravenwood

Test: Tree hugger
Bug: 292141694
Change-Id: Idbd63ceac9dd59f2d51d6289140e5ec1378327d3
diff --git a/tools/hoststubgen/OWNERS b/tools/hoststubgen/OWNERS
new file mode 100644
index 0000000..a8c5321
--- /dev/null
+++ b/tools/hoststubgen/OWNERS
@@ -0,0 +1,3 @@
+omakoto@google.com
+jsharkey@google.com
+jaggies@google.com