Description

As an old-time Mbed user, I want to understand how to use the new Mbed tools

• Create a migration guide to help teach the new tools
• How to do what you used to do with the old tools, but with the new tools now

Issue request type

• Enhancement
• Bug

Tasks

• Come up with lower-level commands where we've removed top level command
• Add rationale for command removal
• mbed-os-5-docs review