add azure_mgmt_resources group_create example back

[cataggar]

The example was dropped in #527 because of conflicting features in the workspace.

56c6057

This feature was needed/tried:

azure_mgmt_resources = { path = "../../", default-features = false, features = ["package-resources-2021-04"] }

because it not in the default:

default = ["package-policy-2021-06", "enable_reqwest"]

May be investigate using no-default-version.