Add initial httpd.conf(5) example for httpd(8)

Requested by deraadt@

src/etc/examples/httpd.conf

@@ -0,0 +1,12 @@
+# $OpenBSD: httpd.conf,v 1.1 2014/07/22 16:58:21 reyk Exp $
+
+# Macros
+ext_addr="egress"
+
+# Global Options
+# prefork 3
+
+# Servers
+server "default" {
+	listen on $ext_addr port 80
+}