Updated Getting Started (markdown)

Getting-Started.md

@@ -22,6 +22,7 @@ If no replication is required, this will be enough. The "mdir" option is to conf
 
 ```bash
 ./weed master -mdir="."
+./weed master -mdir="." -ip=xxx.xxx.xxx.xxx # usually set the ip instead the default "localhost"
 ```
 
 ### Set up Weed Volume Server