added nginix example code

Output-file-example/Nginx-openstack/main.tf

+terraform {
+required_version = ">= 0.14.0"
+  required_providers {
+    openstack = {
+      source  = "terraform-provider-openstack/openstack"
+      version = "~> 1.35.0"
+    }
+  }
+}
+
+# Configure the OpenStack Provider
+provider "openstack" {
+  user_name   = "admin"
+  tenant_name = "admin"
+  password    = "pwd"
+  auth_url    = "http://myauthurl:5000/v2.0"
+  region      = "RegionOne"
+}
+
+resource "openstack_compute_keypair_v2" "user_key" {
+  name       = "user1"
+  public_key = "ssh-rsa XXXXXX"
+}
+
+# Router creation. UUID external gateway
+resource "openstack_networking_router_v2" "generic" {
+  name                = "router-generic"
+  external_network_id = "f67f0d72-0ddf-11e4-9d95-e1f29f417e2f"
+}
+
+# Network creation
+resource "openstack_networking_network_v2" "generic" {
+  name = "ostack2"
+}
+
+#### HTTP SUBNET ####
+
+# Subnet http configuration
+resource "openstack_networking_subnet_v2" "nginx" {
+  name            = "subnet-nginx"
+  network_id      = openstack_networking_network_v2.generic.id
+  cidr            = "16.0.0.0/24"
+  dns_nameservers = ["8.8.8.8", "8.8.8.4"]
+}
+
+# Router interface configuration
+resource "openstack_networking_router_interface_v2" "nginx" {
+  router_id = openstack_networking_router_v2.generic.id
+  subnet_id = openstack_networking_subnet_v2.nginx.id
+}
+
+resource "openstack_compute_secgroup_v2" "http" {
+  name        = "http"
+  description = "Open input http port"
+  rule {
+    from_port   = 80
+    to_port     = 80
+    ip_protocol = "tcp"
+    cidr        = "0.0.0.0/0"
+  }
+}
+
+resource "openstack_compute_secgroup_v2" "ssh" {
+  name        = "ssh"
+  description = "Open input ssh port"
+  rule {
+    from_port   = 22
+    to_port     = 22
+    ip_protocol = "tcp"
+    cidr        = "0.0.0.0/0"
+  }
+}
+
+#
+# Create instance
+#
+resource "openstack_compute_instance_v2" "nginx" {
+  name        = "nginx-host"
+  image_name  = "ubuntu-20.04.3"
+  flavor_name = "t2.small"
+  key_pair    = openstack_compute_keypair_v2.user_key.name
+  network {
+    port = openstack_networking_port_v2.nginx.id
+  }
+}
+
+# Create network port
+resource "openstack_networking_port_v2" "nginx" {
+  name           = "nginx"
+  network_id     = openstack_networking_network_v2.generic.id
+  admin_state_up = true
+  security_group_ids = [
+    openstack_compute_secgroup_v2.ssh.id,
+    openstack_compute_secgroup_v2.http.id,
+  ]
+  fixed_ip {
+    subnet_id = openstack_networking_subnet_v2.nginx.id
+  }
+}
+
+# Create floating ip
+resource "openstack_networking_floatingip_v2" "nginx" {
+  pool = "external-network"
+  fixed_ip = "16.0.0.1"
+}
+
+# Attach floating ip to instance
+resource "openstack_compute_floatingip_associate_v2" "nginx" {
+  floating_ip = openstack_networking_floatingip_v2.nginx.address
+  instance_id = openstack_compute_instance_v2.nginx.id
+}
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