[docs] [issue33876] doc Mention the MicroPython implementation in Introduction

[Andrés Delfino]

New submission from Andrés Delfino <adelfino at gmail.com>:

IMHO, mentioning MicroPython is a plus because it's a mature project with a focus not covered by any of the other mentioned implementations.

PR adds the mention.

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assignee: docs at python
components: Documentation
messages: 319700
nosy: adelfino, docs at python
priority: normal
severity: normal
status: open
title: doc Mention the MicroPython implementation in Introduction
versions: Python 3.6, Python 3.7, Python 3.8

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<https://bugs.python.org/issue33876>
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