add packageversion (#13625)

Co-authored-by: Yan Zhang (WICRESOFT NORTH AMERICA LTD) <v-yanzhang@microsoft.com>

Author: zhangyan133

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

@@ -12,6 +12,7 @@ python:
   payload-flattening-threshold: 2
   namespace: azure.mgmt.apimanagement
   package-name: azure-mgmt-apimanagement
+  package-version: 0.1.0
   clear-output-folder: true
 ```
 ``` yaml $(python) && $(track2)
@@ -20,6 +21,8 @@ azure-arm: true
 license-header: MICROSOFT_MIT_NO_VERSION
 namespace: azure.mgmt.apimanagement
 package-name: azure-mgmt-apimanagement
+package-version: 0.1.0
+clear-output-folder: true
 ```
 ``` yaml $(python) && $(python-mode) == 'update' && !$(track2)
 python: