Implement Client Registration Model / Repository

[jgrandja]

An authorization server must provide a mechanism(s) for registering Clients.

The initial implementation should provide an in-memory implementation of RegisteredClientRepository, similar to InMemoryClientRegistrationRepository in the spring-security-oauth2-client module.

Implementation Requirements

• InMemoryRegisteredClientRepository should store in a Map
• RegisteredClient should provide a Builder, similar to ClientRegistration
• RegisteredClient should be immutable
• javadoc class and public methods
• Unit tests

Specification References

2. Client Registration

[anoopgarlapati]

@jgrandja I would like to start work on this issue.
I want to understand if these classes should initially be in samples package or should I create a specific package for client registration similar to spring-security-oauth2-client module.
Edit: I just rebased my fork and I see that specific modules are created.

[jgrandja]

Thank you @anoopgarlapati. The issue is yours. See #65