Added azure cli notes to the knowledge base

knowledge base/az.md

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+# Azure CLI
+
+## TL;DR
+
+```shell
+# login
+az login
+
+# check a user's permissions
+az ad user get-member-groups --id user@email.org
+
+# list available subscriptions
+az account list --refresh --output table
+
+# set a default subscription
+az account set --subscription subscription-uuid
+
+# set a default resource group
+az configure --defaults group=resource-group
+
+# get credentials for an aks cluster
+az aks get-credentials --resource-group resource-group --name cluster-name --overwrite-existing
+
+# diagnose container registry connectivity issues
+# will run a hello-world image locally
+az acr check-health --name acr-name
+
+# list helm charts in an acr
+az acr helm list -n acr-name -s acr-subscription
+
+# push a helm chart to an acr
+az acr helm push -n acr-name chart.tgz --force
+
+# disable connection verification
+# for proxies with doubtful certificates
+export AZURE_CLI_DISABLE_CONNECTION_VERIFICATION=1
+```
+
+## Further readings
+
+- [Install Azure CLI on macOS]
+- [Get started with Azure CLI]
+- [Sign in with Azure CLI]
+- [How to manage Azure subscriptions with the Azure CLI]
+
+
+[Get started with Azure CLI]: https://docs.microsoft.com/en-us/cli/azure/get-started-with-azure-cli
+[How to manage Azure subscriptions with the Azure CLI]: https://docs.microsoft.com/en-us/cli/azure/manage-azure-subscriptions-azure-cli
+[Install Azure CLI on macOS]: https://docs.microsoft.com/en-us/cli/azure/install-azure-cli-macos
+[Sign in with Azure CLI]: https://docs.microsoft.com/en-us/cli/azure/authenticate-azure-cli