Update README.md with Usage and References to external docs

README.md

@@ -4,6 +4,18 @@
 
 ## Usage
 
+1. Populate the `public_key_openssh` and `KUBECONFIG` variables
+2. Deploy the Terraform module
+3. Wait for `cloud-init` to finish configuring k3s on the VM
+4. Log into the VM and become root
+5. Fill out the `jupyterhub_config.yaml` file with data from a suitable AzureAD app registration
+6. Run the `install_jupyterhub.sh` script
+
+## References
+
+- [K3s](https://docs.k3s.io/installation)
+- [Zero to JupyterHub](https://z2jh.jupyter.org/en/stable/)
+
 <!-- BEGIN_TF_DOCS -->
 ## Requirements