Create readme.python.md (#21972)

* Create readme.python.md

* Update readme.md

Author: msyyc

specification/servicenetworking/resource-manager/readme.md

@@ -37,3 +37,19 @@ These settings apply only when `--tag=package-2022-10-01-preview` is specified o
 input-file:
   - Microsoft.ServiceNetworking/preview/2022-10-01-preview/TrafficController.json
 ```
+
+# Code Generation
+
+## Swagger to SDK
+
+This section describes what SDK should be generated by the automatic system.
+This is not used by Autorest itself.
+
+```yaml $(swagger-to-sdk)
+swagger-to-sdk:
+  - repo: azure-sdk-for-python-track2
+```
+
+## Python
+
+See configuration in [readme.python.md](./readme.python.md)

specification/servicenetworking/resource-manager/readme.python.md

@@ -0,0 +1,19 @@
+## Python
+
+These settings apply only when `--python` is specified on the command line.
+Please also specify `--python-sdks-folder=<path to the root directory of your azure-sdk-for-python clone>`.
+
+``` yaml $(python)
+title: ServiceNetworkingMgmtClient
+azure-arm: true
+license-header: MICROSOFT_MIT_NO_VERSION
+package-name: azure-mgmt-servicenetworking
+namespace: azure.mgmt.servicenetworking
+package-version: 1.0.0b1
+clear-output-folder: true
+```
+
+``` yaml $(python)
+no-namespace-folders: true
+output-folder: $(python-sdks-folder)/servicenetworking/azure-mgmt-servicenetworking/azure/mgmt/servicenetworking
+```