Sweep of servo added in micropython

[ayan-biswas0412]

@alranel @agdl I have added a micropython example of **Sweep of Servo **, Take it as my first contribution to the Portenta Project.

I have already given my introduction in the corresponding repository for Gsoc Check #99 and I have also shared my detailed project proposal please comment on that such that I can rectify more .

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[sebromero]

Thank you for your contribution. This repo contains the Arduino library for controlling servos. Hence any MicroPython example doesn't really belong. I'd encourage you to find another place to add it where it fits better.