LLC, purview, use batch in single readme (Azure#26666)

* llc, purview, use batch in readme

* add artifact-id

Author: weidongxu-microsoft

sdk/purview/azure-analytics-purview-administration/swagger/README_ACCOUNT.md

@@ -0,0 +1,45 @@
+## Generate autorest code
+
+``` yaml
+batch:
+  - package-metadata: true
+  - package-account: true
+```
+
+``` yaml $(package-metadata)
+input-file:
+  - https://raw.githubusercontent.com/Azure/azure-rest-api-specs/main/specification/purview/data-plane/Azure.Analytics.Purview.MetadataPolicies/preview/2021-07-01-preview/purviewMetadataPolicy.json
+
+java: true
+output-folder: ../
+namespace: com.azure.analytics.purview.administration
+license-header: MICROSOFT_MIT_SMALL
+low-level-client: true
+credential-types: tokencredential
+credential-scopes: https://purview.azure.net/.default
+generate-samples: true
+title: PurviewMetadataClient
+service-name: PurviewMetadata
+artifact-id: azure-analytics-purview-administration
+service-versions:
+  - 2021-07-01-preview
+```
+
+``` yaml $(package-account)
+input-file:
+  - https://raw.githubusercontent.com/Azure/azure-rest-api-specs/main/specification/purview/data-plane/Azure.Analytics.Purview.Account/preview/2019-11-01-preview/account.json
+
+java: true
+output-folder: ../
+namespace: com.azure.analytics.purview.administration
+license-header: MICROSOFT_MIT_SMALL
+low-level-client: true
+credential-types: tokencredential
+credential-scopes: https://purview.azure.net/.default
+generate-samples: true
+title: PurviewAccountClient
+artifact-id: azure-analytics-purview-administration
+service-name: PurviewAccount
+service-versions:
+  - 2019-11-01-preview
+```

sdk/purview/azure-analytics-purview-administration/swagger/README_METADATA.md

@@ -11,6 +11,7 @@ low-level-client: true
 credential-types: tokencredential
 credential-scopes: https://purview.azure.net/.default
 title: PurviewCatalogClient
+artifact-id: azure-analytics-purview-catalog
 service-name: PurviewCatalog
 service-versions:
   - 2021-05-01-preview

sdk/purview/azure-analytics-purview-administration/swagger/README_SPEC.md

@@ -11,6 +11,7 @@ low-level-client: true
 credential-types: tokencredential
 credential-scopes: https://purview.azure.net/.default
 title: PurviewScanningClient
+artifact-id: azure-analytics-purview-scanning
 service-name: PurviewScanning
 service-versions:
   - 2018-12-01-preview