Horses

Adding a new ressource: a horse. A horse will can be use as alteranative transport solution, high vallue exchange unit and unity source. New transport type: living annimals, with special size for each annimal type like a size of ten for a horse but one for a chicken. The horse can move a value of ten unit, but use food as fuel, and a bit slower than any vehicle. It can climb easily and doesn't need maintenance but need a specific instalation: stable. can be exchanged as a very valuable ressource or in a contract. Stable provide a small amount of unity, and must be build as additionnal building for a city. Other building, Equestrian center, need horses to make unity and health for citizens, also have a natality bonus (people are happy). Another building, a turf, use horses to raise unity (like a place) but hugely and can increase luxe goods need. Horses can be at start for a "hard mod" instead of pickup. Need vegetables or oats or animal food and water. can be found early game.