exim-config/, firewall/, secrets/: Add references to submodules.

[distorted-ansible] / secrets

diff --git a/secrets b/secrets
new file mode 160000 (submodule)
index 0000000..3de89e0
--- /dev/null
+++ b/secrets
@@ -0,0 +1 @@
+Subproject commit 3de89e0042f54c7c6fc8ebd78c2f30eb87f2f3d4