Andreessen Horowitz announced today in a blog post that it is launching a fund designed to invest in underrepresented and underserved founders. The Talent x Opportunity (TxO) fund, which a16z says was in the works for six months, starts with $2.2 million in donations from the firm’s partners. TxO will be invested in a small group of seed-stage startups the first year and expand in size going forward. “We are looking for entrepreneurs who did not have access to the fast track in life but who have great potential. Their…