Ap 210 register and manage your service

Why

Need to add guidance on how users can register and manage their service.

Guidance on how users can register and manage their service.

this has been reviewed by tech writers.

n/a

Changelog has been updated.

[x] I have checked if any docs change here also requires updates to other repositories (ADRs / RFCs, README.md, Team Manual, elsewhere in these docs)
[x] Where there is any overlap I have updated or opened a PR for corresponding changes