Implement downloading chart from ACR

Edited (@nitishm) : _Formatting_

Please implement downloading `ApplicationGroup` chart from ACR.
Have chart in ACR crmobilenetwork.azurecr.io/hello-world:1.0.3
helm chart looks like this:

```yaml
apiVersion: orkestra.azure.microsoft.com/v1alpha1
kind: ApplicationGroup
metadata:
name: bookinfo
spec:
applications:
- name: bookinfo
spec:
chart:
url: "crmobilenetwork.azurecr.io"
name: hello-world
version: 1.0.3
release:
targetNamespace: bookinfo2
workflow:
- name: generic-executor
type: custom
image:
name: generic-executor
image: crmobilenetwork.azurecr.io/generic-executor:1.0.0
params:
data:
foo: bar
```