[Feature Request] The sample related to calling Azure API is quite old. Could it be updated to use the new Azure SDK?

**Is your feature request related to a problem? Please describe.**
The sample code related to calling Azure API is quite old (3-WebApp-multi-APIs/README.md).

**Describe the solution you'd like**
 It would be good if it could be updated to use the up-to-date Azure SDK for .NET

**Describe alternatives you've considered**
n/a

**Additional context**
n/a
