Add note on using the faas-cli with Microsoft Entra

[welteki]

Description

When authenticating with Microsoft Entra using the faas-cli, the implicit-id flow needs to be used. The --redirect-host flag needs to be set to http://localhost because Entra does not allow adding 127.0.01 to the list of allowed redirect urls.

Motivation and Context

• I have raised an issue to propose this change (required)

Add missing instructions for using the faas-cli with Microsoft Entra for authentication.

How Has This Been Tested?

Verified the example command is working.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s