Create arduino.gitignore

[Chardelyce]

This is useful for arduino projects :)

• from: https://github.com/arduino/Arduino/blob/master/.gitignore
• application homepage: https://www.arduino.cc/en/software

Reasons for making this change: I having an Arduino project in my own private repo have found this template useful for getting rid of bloat files from the Arduino application

Links to documentation supporting these rule changes: https://github.com/arduino/Arduino/blob/master/.gitignore

• Link to application or project’s homepage:
• https://www.arduino.cc/en/software

[Chardelyce]

Closing