Add contribution guidelines #100

CONTRIBUTING.md

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+# Contributing Guidelines
+
+:+1::tada: First off, thanks for considering to contribute to this project! :tada::+1:
+
+These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+## Git hooks
+
+We use git hooks through [pre-commit](https://pre-commit.com/) to enforce and automatically check some "rules". Please install it before to push any commit.
+
+See the relevant configuration file: `.pre-commit-config.yaml`.
+
+## Code Style
+
+Make sure your code *roughly* follows [PEP-8](https://www.python.org/dev/peps/pep-0008/) and keeps things consistent with the rest of the code:
+
+- docstrings: [sphinx-style](https://sphinx-rtd-tutorial.readthedocs.io/en/latest/docstrings.html#the-sphinx-docstring-format) is used to write technical documentation.
+- formatting: [black](https://black.readthedocs.io/) is used to automatically format the code without debate.
+- static analisis: [flake8](https://flake8.pycqa.org/en/latest/) is used to catch some dizziness and keep the source code healthy.