Review and add pre-commit configuration

[navarroc]

Add a .pre-commit-config.yaml to the parent folder:

repos:

• repo: https://github.com/PyCQA/isort rev: 5.9.3 hooks:
  • id: isort
• repo: https://github.com/python/black rev: 21.7b0 hooks:
  • id: black
• repo: https://gitlab.com/pycqa/flake8 rev: 3.9.2 hooks:
  • id: flake8
• repo: https://github.com/pre-commit/pre-commit-hooks rev: v4.0.1 hooks:
  • id: check-byte-order-marker
  • id: trailing-whitespace
  • id: end-of-file-fixer