add documentation

docs/getting-started.md

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+Getting started
+===============
+
+The easiest way to run the deployement is to use the **kargo-cli** tool. 
+A complete documentation can be found in its [github repository](https://github.com/kubespray/kargo-cli).
+
+Here is a simple example on AWS: 
+
+* Create instances and generate the inventory
+
+```
+kargo aws --instances 3
+```
+
+* Run the deployment 
+
+```
+kargo deploy --aws -u centos -n calico
+```