Adding readme for vyatta firewall example

Change-Id: Idafcf90b6424f1177438dbd49be657765bb8c0b1

examples/v2/services_registration/vyatta/README.md

@@ -0,0 +1,41 @@
+Vyatta Firewall example (based on v2 API/DSL)
+=============================================
+
+The example is created to demonstrate how Mistral can be used to interact
+with third party service's API through HTTP requests. This specific example
+works with Vyatta Firewall service. Mistral uses auth information provided by
+the user to retrieve Vyatta configuration URL. Then it creates accept rule in Firewall
+service, sets IP address, protocol and port to this rule and commit transaction.
+
+How to run
+----------
+
+1. Load workbook from vyatta_firewall.yaml:
+
+
+    mistral workbook-create vyatta_firewall.yaml
+
+2. Create input.json file containing workflow input:
+
+
+    {
+      "machine_ip": [your machine IP],
+      "machine_name": [your machine name],
+      "port": [Firewall port to open],
+      "vyatta_host": [Zabbix host],
+      "vyatta_username": [Zabbix username],
+      "vyatta_password": [Zabbix password],
+    }
+
+3. Run the execution:
+
+
+    mistral execution-create vyatta.register_in_vyatta_firewall input.json
+
+4. Using execution id from the previous step wait for completion (workflow SUCCESS state):
+
+
+    mistral execution-get <execution_id>
+
+5. Log in your Vyatta and check Firewall service. You will see new accept rule with configured
+IP address, protocol and port.