Adding basic readme.

README.md

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+# Australis
+
+A light-weight client for [Apache Aurora](https://aurora.apache.org/) built using [gorealis](https://github.com/paypal/gorealis).
+
+## Usage 
+
+```
+Usage:
+  australis [command]
+
+Available Commands:
+  create      Create an Aurora Job
+  help        Help about any command
+  kill        Kill an Aurora Job
+  start       Start a service or maintenance on a host (DRAIN).
+  stop        Stop a service or maintenance on a host (DRAIN).
+
+Flags:
+  -h, --help               help for australis
+  -p, --password string    Password to use for API authentification
+  -u, --username string    Username to use for API authentification
+  -z, --zookeeper string   Zookeeper node(s) where Aurora stores information.
+
+Use "australis [command] --help" for more information about a command.
+```
+
+
+## Status
+Australis is a work in progress and does not support all the features of Apache Aurora.