NVIDIA JetBot Ultrasonic Front

A 3D printed front for the original 3D printable Nvidia Jetbot that functions as an holder for an ultrasonic sensor. For more details on installing the Ultrasonic sensor and interfacing it with the Jetson Nano check [here](https://thestrongestlink.nl/2020/05/31/ultrasonic-sensor-for-the-jetbot/).

9/8/20: Please note that the initial design is for an ultrasonic sensor with mounting holes positioned at 15 mm x 38.1 mm, However, I was kindly informed that there are also ultrasonic sensors with mounting holes at 15 mm x 40 mm. I added a modified version for 40 mm.