add api-version of guest configuration to go SDK (Azure#12217)

Author: ArcturusZhang

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

@@ -0,0 +1,26 @@
+## Go
+
+These settings apply only when `--go` is specified on the command line.
+
+``` yaml $(go)
+go:
+  license-header: MICROSOFT_APACHE_NO_VERSION
+  namespace: guestconfiguration
+  clear-output-folder: true
+```
+
+### Go multi-api
+
+``` yaml $(go) && $(multiapi)
+batch:
+  - tag: package-2020-06-25
+```
+
+### Tag: package-2020-06-25 and go
+
+These settings apply only when `--tag=package-2020-06-25 --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-2020-06-25' && $(go)
+output-folder: $(go-sdk-folder)/services/$(namespace)/2020-06-25/$(namespace)
+```

specification/guestconfiguration/resource-manager/readme.md

@@ -112,6 +112,7 @@ This is not used by Autorest itself.
 
 ``` yaml $(swagger-to-sdk)
 swagger-to-sdk:
+  - repo: azure-sdk-for-go
   - repo: azure-cli-extensions
   - repo: azure-resource-manager-schemas
     after_scripts: