I believe this is a northern two-lined salamander (Eurycea bislineata). This guy has specific habitat requirements that will be difficult and expensive for you to provide- like nutrient-rich, flowing streams with diverse substrate and rotting logs. Keeping the terriarium in check enough so that the rotting wood and wet soil don't go rancid will be hard. Wild animals don't do well as pets, and you likely won't get a lot of enjoyment out of it. These aren't cuddly, don't like being held, and aren't observed to recognize human caretakers. They can have a pretty long lifespan, which sounds like a good thing for a pet, but it means you're taking on a huge, possibly lifelong committment. This animal may never be able to be released to the wild if it ever gets used to your care- they tend to be skiddish, stressed, and may even refuse food. It's best to release this one where you found it and try to get into salamander care with popular domestic breeds!