roles/nginx: Add role for nginx

This role installs nginx and provides a base/skeleton configuration
suitable for most deployments.

roles/nginx/handlers/main.yml

@@ -0,0 +1,7 @@
+- name: reload nginx
+  service:
+    name=nginx
+    state=reloaded
+- name: save firewalld configuration
+  command:
+    firewall-cmd --runtime-to-permanent