Added load balancer info

gui/README.md

@@ -196,6 +196,15 @@ where **<internal_subnet_ID>** is an ID of internal subnet used by your instance
 
 For more info, please refer to [https://docs.openstack.org/octavia/train/user/guides/basic-cookbook.html#basic-lb-with-hm-and-fip](https://docs.openstack.org/octavia/train/user/guides/basic-cookbook.html#basic-lb-with-hm-and-fip).
 
+
+<div style="border-width:0;border-left:5px solid #b8d6f4;background-color:rgba(228,240,251,0.3);margin:20px 0;padding:10px 20px;font-size:15px;">
+  <strong>Notice:</strong><br/>
+  Sometimes it can happen that Load Balancer is working but connection is not working because it is not added into security groups. To solve this you
+  have to add the Load Balancer ingress traffic IP rule.
+  </div>
+
+
+
 LBaaS (Load Balancer as a service) provides user with load balancing service, that can be fully managed via OpenStack API (some basic tasks are supported by GUI). Core benefits:
 * creation and management of load balancer resources can be easily automatized via API, or existing tools like Ansible or Terraform
 * applications can be easily scaled by starting up more OpenStack instances and registering them into the load balancer
@@ -205,6 +214,8 @@ LBaaS (Load Balancer as a service) provides user with load balancing service, th
 
 Official documentation for LBaaS (Octavia) service - https://docs.openstack.org/octavia/latest/user/index.html
 
+
+
 ##Cloud orchestration tools
 
 ### Terraform