added new default values

defaults/main.yml

 ---
+
 www_root_directory: "/var/www"
+www_user: "www"
+www_group: "www"
+www_ssl_priv_key: ""
+www_ssl_cert: ""
+www_ssl_ca_cert: ""
 www_mimetypes: []
 www_list_directory: false
 www_index_files: ["index.html"]