LONDON (AP) — It will be a spring wedding on the glorious grounds of Windsor Castle for love-struck Prince Harry and Meghan Markle. Royal officials — thrilled with the international response to news of the couple’s engagement, and the positive reaction to their first ever TV appearance — revealed a few key details Tuesday but kept mum on others, such as who will be Harry’s best man? The wedding will be in May, but the date has not been chosen, Harry’s communications secretary, Jason Knauf, told a packed briefing at Buckingham Palace. “In a happy moment in their lives, it means a great deal to them that so many people throughout the UK, the Commonwealth and around the world are celebrating with them,” he said before fielding questions about things like how many of Markle’s rescue dogs would move to Britain with her. Knauf said Harry’s grandmother, Queen Elizabeth II, had given permission for the couple to wed at St. George’s Chapel, the historic church on the Windsor Castle grounds that has long been a touchstone for royal rites of passage. He said the 91-year-old monarch will attend the wedding. Windsor Castle, west of London, is one of the queen’s…