ADD usage-example for escargo/errors
DEL remove the usage-example/ - keep it lean
MOD FIN version of escargo/errors

MOD rename errors.ErrGenFn to errors.TypedError
ADD errors.TypedError.Instance method
ADD blackbox tests for errors
ADD LICENSE
MOD FIN finalize errors.TypeError api

MOD rename TypedError.Instance to Matches
ADD project & package overview readmes.