add documentation

docs/cloud.md

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+Cloud providers
+==============
+
+#### Provisioning
+
+You can use kargo-cli to start new instances on cloud providers
+here's an example
+```
+kargo [aws|gce] --nodes 2 --etcd 3 --cluster-name test-smana
+```
+
+#### Deploy kubernetes
+
+With kargo-cli
+```
+kargo deploy [--aws|--gce] -u admin
+```
+
+Or ansible-playbook command
+```
+ansible-playbook -u smana -e ansible_ssh_user=admin -e cloud_provider=[aws|gce] -b --become-user=root -i inventory/single.cfg cluster.yml
+```