Update installation instuctions to use release binary (#20)

* Update installation instructions to use release binary

README.md

@@ -2,18 +2,22 @@
 
 The `wksctl` command allows simple creation of a Kubernetes cluster given a **set of IP addresses** and an **SSH key**. It can be run in a standalone environment but is best used via a [GitOps approach](https://www.weave.works/technologies/gitops/) in which cluster and machine descriptions are stored in Git and the state of the cluster tracks changes to the descriptions.
 
+## Install wksctl binary 
 
-## Install `wksctl`
+1. Download the OS specific `wksctl` release package from the [release page](https://github.com/weaveworks/wksctl/releases)
+1. Unpack and add the `wksctl` binary to your path
 
-```console
-git clone [email protected]:weaveworks/wksctl.git
-cd wksctl
-make install
+For example:
+```
+cd <download dir>
+tar xf wksctl-0.7.0-linux-x86_64.tar.gz
+chmod +x wksctl
+sudo mv wksctl /usr/local/bin/
 ```
 
 ## Quick start
 
-The [examples](examples) folder contains guides to get you up and running with [Footloose](https://github.com/weaveworks/footloose), [Vagrant](https://www.vagrantup.com) and others!
+The [examples](examples) folder (also included in the release package download) contains guides to get you up and running with [Footloose](https://github.com/weaveworks/footloose), [Vagrant](https://www.vagrantup.com) and others!
 
 ## Modes of use