message: Add API.md for plugin
diff: @@ -14,6 +14,8 @@ import { Logger as Logger_2 } from 'winston';
  //
  // @public (undocumented)
  export interface ClusterDetails {
  + // (undocumented)
  + assumeRole?: string;
  // (undocumented)
  authProvider: string;
  // (undocumented)
  