add the lisence header
> see https://aka.ms/autorest
``` yaml
+azure-arm: true
require:
- https://github.com/Azure/azure-rest-api-specs/blob/{{commitID}}/specification/{{rpName}}/resource-manager/readme.md
- https://github.com/Azure/azure-rest-api-specs/blob/{{commitID}}/specification/{{rpName}}/resource-manager/readme.go.md
+license-header: MICROSOFT_MIT_NO_VERSION
module-version: 0.1.0
```
\ No newline at end of file
