Adding readme for multiple services example

Change-Id: Ic5451c80a3dfe0df7d573248dd03f861d9a54411

examples/v2/services_registration/README.md

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+Multiple services registration example (based on v2 API/DSL)
+============================================================
+
+The example is created to demonstrate how Mistral can be used to interact
+with multiple third party service's API. This specific example
+works with Vyatta Firewall service and Zabbix monitoring service. It registers
+a newly created VM in Zabbix service and Vyatta Firewall. It
+requires two created workflows - Zabbix machine registration and Vyatta
+Firewall. They can be found in corresponding directories - 'zabbix' and 
+'vyatta'.
+
+How to run
+----------
+
+1. Load workbook from multiple_services_registration.yaml:
+
+
+    mistral workbook-create multiple_services_registration.yaml
+
+2. Make sure you have created Zabbix and Vyatta workflows:
+
+
+    mistral workbook-update vyatta_firewall.yaml
+    mistral workbook-update zabbix_machine_registration.yaml
+
+3. Create input.json file containing workflow input:
+
+
+    {
+      "server_name": [Name of the new instance],
+      "server_port": [Port to open],
+      "image_id": [image id from Glance service],
+      "flavor_id": [flavor id - type of instance hardware],
+      "ssh_username": [VM username],
+      "ssh_password": [VM password],
+      "zabbix_host": [Zabbix host],
+      "zabbix_username": [Zabbix username],
+      "zabbix_password": [Zabbix password],
+      "vyatta_host": [Vyatta host],
+      "vyatta_username": [Vyatta username],
+      "vyatta_password": [Vyatta password],
+    }
+
+4. Run the execution:
+
+
+    mistral execution-create register_in_multiple_services.create_and_register input.json
+
+5. Using execution id from the previous step wait for completion (workflow SUCCESS state):
+
+
+    mistral execution-get <execution_id>
+
+6. Check your Zabbix host group. You will see new host group, one host in it and one simple check item.
+Log in your Vyatta and check Firewall service. You will see new accept rule with configured
+IP address, protocol and port.