added nginx role

roles/nginx/templates/nginx-config.j2

@@ -0,0 +1,10 @@
+server {
+        listen 80 ;
+        listen [::]:80 ;
+        server_name {{ domain_name }} ;
+        root /var/www/{{ nginx_root }} ;
+        index index.html index.htm index.nginx-debian.html ;
+        location / {
+                try_files $uri $uri/ =404 ;
+        }
+}