Add readme of cli codegen for ml (#8890)

* add readme.az.md

* Revert "add readme.az.md"

This reverts commit 20bd01f.

* add readme.az.md for kusto

* update readme.md for az pipeline

* add codegen config for az

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

@@ -0,0 +1,12 @@
+## AZ
+
+These settings apply only when `--az` is specified on the command line.
+
+``` yaml $(az)
+az:
+  extensions: machinelearningservices
+  namespace: azure.mgmt.machinelearningservices
+  package-name: azure-mgmt-machinelearningservices
+python-sdk-output-folder: "$(output-folder)/src/machinelearningservices/azext_machinelearningservices/vendored_sdks/machinelearningservices"
+
+```

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

@@ -0,0 +1,9 @@
+ CLI
+
+These settings apply only when `--cli` is specified on the command line.
+
+``` yaml $(cli)
+#cli:
+#  test-scenario:
+#    - name: Workspace_CreateOrUpdate
+```

specification/machinelearningservices/resource-manager/readme.md

@@ -118,6 +118,7 @@ swagger-to-sdk:
   - repo: azure-sdk-for-python
   - repo: azure-sdk-for-js
   - repo: azure-sdk-for-node
+  - repo: azure-cli-extensions
 ```
 
 ## C#