Adding documentation on handling errors
Adding documentation on handling errors

goldensunliu/marty-lib,KeKs0r/marty-lib,Driftt/marty,thredup/marty,thredup/marty-lib,bigardone/marty,gmccrackin/marty-lib,kwangkim/marty,kwangkim/marty,Driftt/marty,martyjs/marty,martyjs/marty-lib,oliverwoodings/marty,bigardone/marty,bigardone/marty,kwangkim/marty,martyjs/marty,oliverwoodings/marty,CumpsD/marty-lib,thredup/marty