add whole snapshot folder to gitignore
add whole snapshot folder to gitignore


Former-commit-id: 3c59fcc5318772efa690c7113c0da4e10ba5574b [formerly 8a1d962d979b7be1a53b7b9b1de58b9d5998f3d7]
Former-commit-id: 7ca24b773afa55a42bb8f9a78ae87b183cca6371
arduino/arduino-create-agent,arduino/arduino-create-agent,arduino/arduino-create-agent,arduino/arduino-create-agent