Updates readme

Author: solankisamir

specification/apimanagement/resource-manager/readme.md

@@ -34,13 +34,64 @@ tag: package-preview-2021-04
 ``` yaml
 modelerfour:
   lenient-model-deduplication: true
+tag: package-preview-2021-12
 ```
 
+
+### Tag: package-preview-2021-12
+
+These settings apply only when `--tag=package-preview-2021-12` is specified on the command line.
+
+```yaml $(tag) == 'package-preview-2021-12'
+input-file:
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimanagement.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimapis.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimapisByTags.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimapiversionsets.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimauthorizationservers.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimbackends.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimcaches.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimcertificates.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimconnectivitycheck.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimcontenttypes.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimdeletedservices.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimdeployment.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimdiagnostics.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimemailtemplates.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimgateways.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimgroups.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimidentityprovider.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimissues.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimloggers.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimnamedvalues.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimnetworkstatus.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimnotifications.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimopenidconnectproviders.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimoutbounddependency.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimpolicies.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimpolicydescriptions.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimportalrevisions.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimportalsettings.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimprivatelink.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimproducts.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimproductsByTags.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimquotas.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimregions.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimreports.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimsettings.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimskus.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimsubscriptions.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimtagresources.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimtags.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimtenant.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/apimusers.json
+  - Microsoft.ApiManagement/preview/2021-12-01-preview/definitions.json
+```
 ### Tag: package-preview-2021-04
 
 These settings apply only when `--tag=package-preview-2021-04` is specified on the command line.
 
-```yaml $(tag) == 'package-preview-2021-04'
+``` yaml $(tag) == 'package-preview-2021-04'
 input-file:
   - Microsoft.ApiManagement/preview/2021-04-01-preview/apimanagement.json
   - Microsoft.ApiManagement/preview/2021-04-01-preview/apimapis.json
@@ -85,6 +136,7 @@ input-file:
   - Microsoft.ApiManagement/preview/2021-04-01-preview/apimconnectivitycheck.json
   - Microsoft.ApiManagement/preview/2021-04-01-preview/definitions.json
 ```
+
 ### Tag: package-preview-2021-01
 
 These settings apply only when `--tag=package-preview-2021-01` is specified on the command line.