Update Services/nginx/selfssl.README

Services/nginx/selfssl.README

@@ -1,5 +1,5 @@
 cd /srv/containers/nginx/ssl
-mkdir [DOMAIN]
+mkdir [DOMAIN] && cd [DOMAIN]
 openssl genrsa -out wildcard.[DOMAIN].key 4096
 openssl req -x509 -nodes -days 825 -key wildcard.[DOMAIN].key -out wildcard.[DOMAIN].crt