track1 add batch tag to cost-management and storagecache in readme.go.md (#15430)

Author: Alancere

specification/cost-management/resource-manager/readme.go.md

@@ -17,6 +17,7 @@ batch:
    - tag: package-2019-01
    - tag: package-preview-2019-03
    - tag: package-2019-10
+   - tag: package-2019-11
    - tag: package-2020-06
    - tag: package-2021-01
 ```

specification/storagecache/resource-manager/readme.go.md

@@ -13,13 +13,23 @@ go:
 
 ``` yaml $(go) && $(multiapi)
 batch:
+  - tag: package-2021-05
   - tag: package-2021-03
   - tag: package-2020-10-01
   - tag: package-2020-03-01
   - tag: package-2019-11-01
   - tag: package-2019-08
 ```
 
+### Tag: package-2021-05 and go
+
+These settings apply only when `--tag=package-2021-05 --go` is specified on the command line.
+Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
+
+``` yaml $(tag) == 'package-2021-05' && $(go)
+output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2021-05-01/$(namespace)
+```
+
 ### Tag: package-2021-03 and go
 
 These settings apply only when `--tag=package-2021-03 --go` is specified on the command line.