readme.az.md for compute (Azure#12839)

specification/compute/resource-manager/readme.az.md

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+## AZ
+
+These settings apply only when `--az` is specified on the command line.
+
+``` yaml $(az) && $(target-mode) == "core"
+az:
+  extensions: vm
+  namespace: azure.mgmt.compute
+  package-name: azure-mgmt-compute
+az-output-folder: $(azure-cli-folder)/src/azure-cli/azure/cli/command_modules/vm
+python-sdk-output-folder: "$(az-output-folder)/vendored_sdks/vm"
+cli:
+    cli-directive:
+        - where:
+            group: "*"
+            op: "*"
+          hidden: true
+        - where:
+            group: "SshPublicKeys"
+            op: "*"
+          hidden: false
+directive: 
+  - where: 
+      command: vm ssh-public-key
+    set:
+      command: sshkey
+```

specification/compute/resource-manager/readme.cli.md

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+``` yaml
+# add any configuration here for all CLI languages
+# refer to the faq.md for more details
+```