(Reuters) – SoftBank Group Corp has agreed to invest $1 billion in U.S. satellite venture OneWeb Ltd, marking the first tranche of a $50 billion U.S. investment the Japanese telecoms and technology company's founder Masayoshi Son pledged to President-elect Donald Trump. "Earlier this month, I met with President-Elect Trump and shared my commitment to investing and creating jobs in the United States," Son said in a joint statement with OneWeb. "This is the first step in that commitment." The investment is part of a $1. …