Adding README.md to zabbix_machine_registration example

Change-Id: Ifa488b120f1fffa67cc26f684dec712e085bc29f

examples/v2/services_registration/zabbix/README.md

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+Zabbix registration 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 Zabbix monitoring service. Mistral uses auth information provided by
+the user to retrieve Zabbix auth token. Then it creates host group (in terms of
+Zabbix), host with given machine IP and sets simple check item - ping machine
+every 5 seconds.
+
+How to run
+----------
+
+1. Load workbook from zabbix_machine_registration.yaml:
+
+
+    mistral workbook-create zabbix_machine_registration.yaml
+
+2. Create input.json file containing workflow input:
+
+
+    {
+      "machine_ip": [your machine IP],
+      "machine_port": [your machine port],
+      "zabbix_host": [Zabbix host],
+      "zabbix_username": [Zabbix username],
+      "zabbix_password": [Zabbix password],
+    }
+
+3. Run the execution:
+
+
+    mistral execution-create zabbix.register_in_zabbix input.json
+
+4. Using execution id from the previous step wait for completion (workflow SUCCESS state):
+
+
+    mistral execution-get <execution_id>
+
+5. Check your Zabbix host group. You will see new host group, one host in it and one simple check item.