PHILADELPHIA — Former President Donald Trump made a brief stop in Philadelphia on Saturday to announce his new sneaker brand and remind a crowd of sneakerheads to vote. Just hours before a planned campaign rally in Michigan, Trump took the stage for less than 10 minutes at Sneaker Con in the Pennsylvania Convention Center. Branding itself as the “Greatest Sneaker Show on Earth,” the multicity event came to Philadelphia for the second time this year. “He is someone who you would have not thought or guessed would have joined the sneaker community,” said Chase Young, founder of Philadelphia footw…