Chaining the CreateMember command from the Forum subdomain

The transaction that created a user in the Users subdomain has finished executing. The last piece to the puzzle in decoupling business logic between subdomains in a modular monolith is getting the Forum subdomain to react to the UserCreated event.

From the Forum subdomain, we can create a class to act as a subscriber to the UserCreated event. For scan-ability at the folder level, my personal preference is to name these like After-[event name]

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