Update README.md

Author: G. Tsirkas

README.md

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 # Gluster Storage - Zabbix
 ![Zabbix Glusterfs](https://i.imgur.com/K7OP7uM.png)
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 This project was created to monitor Gluster Storage with Zabbix.
 In this repository there are two files.
 One python script that calls [gstatus](https://github.com/gluster/gstatus), discovering gluster volumes and print data we want, according to the arguments given.