add example how to use: requires_scope

[copdips]

Could you please add example how to use requires_scope():

ms-identity-python-webapi-azurefunctions/Function/secureFlaskApp/__init__.py

Line 127 in 83a67bd

def requires_scope(required_scope):

[giuliohome]

Yes, I would ask the same, notice also that the access token must be produced with a scope/claim otherwise the aud of the access token won't be correct, see https://stackoverflow.com/questions/74886417/azure-authentication-access-token-returning-wrong-aud00000003-0000-0000-c000