Update install.md (#342)

Per email thread with weinong, proposing a PR to provide additional pathway to install kubelogin on Linux via https://learn.microsoft.com/en-us/cli/azure/aks?view=azure-cli-latest#az-aks-install-cli(). Providing suggested additional pathway, since asdf seems to encounter installation difficulty on Linux and with AKS.

This is also briefly discussed at the bottom of the issue #173

docs/book/src/install.md

@@ -33,6 +33,13 @@ asdf plugin update kubelogin
 asdf install kubelogin latest
 asdf global kubelogin latest
 ```
+### Using azure cli
+There is another option to install Kubectl and Kubectl login. Documentation on this is here: https://learn.microsoft.com/en-us/cli/azure/aks?view=azure-cli-latest#az-aks-install-cli()
+
+```
+# install (May require using the command ‘sudo’)
+az aks install-cli
+```
 
 ## Windows