Add section to README for any instance features.
Created by: xaviershay
rspec/rspec-mocks#578
Tidies up #579
@thomas-holmes @myronmarston
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: xaviershay
rspec/rspec-mocks#578
Tidies up #579
@thomas-holmes @myronmarston