Graph endpoints

[kuraisle]

Is this the right issue type?

• Yes, I'm planning work for this project team.

Summary

As discussed in https://github.com/orgs/Health-Informatics-UoN/discussions/37 it would help engineers with mapping to be able to explore different relationships between concepts.

Acceptance Criteria

• Router for relationships
• endpoints for graphs

Confirm creation

• Ready to create this feature?