Move letters endpoint to its own sub-directory#528

BarryPiccinni wants to merge 1 commit intonew-post-apply-serviceministryofjustice/cica-apply-data-capture-service:new-post-apply-servicefrom

bp/new-post-apply-serviceministryofjustice/cica-apply-data-capture-service:bp/new-post-apply-serviceCopy head branch name to clipboard