Update README.md

README.md

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 quick and dirty server availability check <br>
 
 requires fping and nmap (and bash)
+
+# usage
+Usage: conn (options) [ip] <br>
+Options: <br>
+ -m/--multi -- test multiple ips / disable portscan" <br>
+ -h/--help -- show help" <br>
+ -6/--force-ipv6 -- force ipv6 portscanning (also forces portscanning)" <br>
+ -y/--yes -- portscan without asking" <br>
+ -n/--no -- dont portscan" <br>
+ -p/--portscan -- same as -y" <br>