sprints: Add MicroPython & emlearn (#1821)

Hello. Here is a PR for a sprint :)

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Nikoś <nikoshell20@gmail.com>

Author: 3 people

src/content/sprints/micropython-emlearn.md

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+---
+title: "MicroPython & emlearn"
+numberOfPeople: "10" # How many people you expect to be able to accommodate.
+pythonLevel: "Any" # Any, Beginner, Intermediate, or Advanced.
+contactPerson: # The main person to reach out to regarding the sprint.
+  name: "Jon Nordby"
+  email: "jononor@gmail.com"
+  github: "jonnor"
+links: # Add as many links as relevant.
+  - title: "MicroPython - a tiny Python for microcontrollers"
+    url: "https://micropython.org/"
+  - title:
+      "emlearn-micropython: Machine Learning and Digital Signal processing for
+      MicroPython"
+    url: "https://github.com/emlearn/emlearn-micropython/"
+  - title: "IoT sensors with MicroPython (course materials)"
+    url: "https://github.com/jonnor/micropython-iot-sensors-course"
+---
+
+Interesting in using your Python skills to make physical devices, such as
+sensors, control systems, robots or similar? MicroPython is an implementation of
+Python 3 that runs on low-cost microcontrollers and has a mature ecosystem that
+makes programming hardware fun and productive.
+
+In this sprint we will work on MicroPython related things, such as:
+
+- Making demos/examples for/using existing libraries
+- Creating new libraries for MicroPython
+
+Open for people who have no prior experience with MicroPython! We have 5
+hardware units running MicroPython that people can borrow for the sprint
+(Raspberry Pi Pico W RP2040).
+
+You can also run MicroPython on your PC, as well as in the browser.