Feature Request: support for Kubernetes CRDs

I tried to use `yaml.schemas` to associate kubernetes CRD schemas but this is not working. I added this entry to vscode user settings:

```
"yaml.schemas": {
        "file:///path/to/application-swagger-latest.json": "/**"
    }
```

I also tried:

```
"yaml.schemas": {
        ./path/to/application-swagger-latest.json": "/**"
    }
```

with no success.

 