appconfiguration: adding the autorest config needed for a Go Data Plane SDK (#15317)

Author: tombuildsstuff

specification/appconfiguration/data-plane/readme.go.md

@@ -0,0 +1,19 @@
+## Go
+These settings apply only when `--go` is specified on the command line.
+``` yaml $(go)
+go:
+  license-header: MICROSOFT_MIT_NO_VERSION
+  clear-output-folder: true
+```
+### Go multi-api
+``` yaml $(go) && $(multiapi)
+batch:
+  - tag: package-1-0
+```
+### Tag:  package-1-0 and go
+These settings apply only when `--tag=package-1-0 --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-1-0' && $(go)
+namespace: appconfiguration
+output-folder: $(go-sdk-folder)/services/appconfiguration/1.0/$(namespace)
+```