Mediaservice gosdk (#15209)

* add tag into readme.go.md

* add tag to readme.go.md to release gosdk

* add tag to readme.go.md for mediaservices

Author: chenjianfei2017

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

@@ -13,6 +13,7 @@ go:
 
 ```yaml $(go) && $(multiapi)
 batch:
+  - tag: package-2021-06
   - tag: package-2021-05
   - tag: package-2020-05
   - tag: package-2015-10
@@ -22,6 +23,15 @@ batch:
   - tag: package-2019-05-preview
 ```
 
+### Tag: package-2021-06 and go
+
+These settings apply only when `--tag=package-2021-06 --go` is specified on the command line.
+Please also specify the `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
+
+```yaml $(tag) == 'package-2021-06' && $(go)
+output-folder: $(go-sdk-folder)/services/mediaservices/mgmt/2021-06-01/$(namespace)
+```
+
 ### Tag: package-2021-05 and go
 
 These settings apply only when `--tag=package-2021-05 --go` is specified on the command line.