docs: add main badges

- build
- coverage
- commit
- license

Author: aleattene

README.md

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 ## 🧩 Python Challenges 🐍
 
+![Python](https://badgen.net/badge/Built%20with/Python/blue)
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+[![Tests](https://github.com/aleattene/advent-of-code/actions/workflows/aoc-tests.yml/badge.svg)](https://github.com/aleattene/advent-of-code/actions/workflows/aoc-tests.yml)
+[![GitHub commits](https://badgen.net/github/commits/aleattene/python-challenges)](https://github.com/aleattene/python-challnges/commits/)
+[![GitHub last commit](https://img.shields.io/github/last-commit/aleattene/python-challenges)](https://github.com/aleattene/python-challenges/commits/)
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+
 A collection of my **python coding challenges** and practice **exercises**, focusing on **problem solving**, **data structures**, and **algorithms**.
 
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