[Documentation] Auto-generated Spring REST doc

[xieus]

Basic Requirement

• Use an automatic way to generate REST API document for API gateway and others microservices listed in this directory: https://github.com/futurewei-cloud/alcor/tree/master/services

Resource
https://github.com/asciidoctor/asciidoctor-intellij-plugin/wiki/Spring-REST-Docs-support

[xieus]

@skdong, would you like to take the lead on this item?

[skdong]

OK, I will do my best

[xieus]

Thank you for the contribution. The task has been assigned.