By Caroline Valetkevitch NEW YORK, July 29 (Reuters) - U.S. stocks added to their recent rally on Friday after upbeat forecasts from Apple AAPL.O and Amazon.com AMZN.O, and the S&P 500 and Nasdaq posted their biggest monthly percentage gains since 2020. In other earnings, Intel Corp INTC.O shares fell after the company cut annual sales and profit forecasts and missed second-quarter estimates. Data showed U.S. consumer spending increased more than expected in June as Americans paid more for goods and services, with monthly inflation surging by the most since 2005.