Add pre-commit hooks

[vesnikos]

See https://pre-commit.com/ website and various other technical sites for a more full description

Pre-commit hooks are scripts or actions that are run automatically before a commit is made to a version control system, such as Git. They serve as a quality control mechanism by allowing you to enforce certain checks and standards on the codebase before it is committed. Here are some reasons why including pre-commit hooks in a project can be beneficial:

1. Consistency
2. Code quality
3. Time savings
4. Continuous Integration
5. Codebase maintenance
6. collaboration

at the very minimun pre-commit hooks should apply code styling rules and file checking

see https://pre-commit.com/hooks.html for a list of pre-defined hooks (mirrors-prerrier for js)

other hooks could be:

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.1.0
    hooks:
      - id: check-added-large-files # prevents giant files from being committed.
      - id: check-case-conflict # checks for files that would conflict in case-insensitive filesystems.
      - id: check-merge-conflict # checks for files that contain merge conflict strings.
      - id: check-yaml # checks yaml files for parseable syntax.
      - id: detect-private-key # detects the presence of private keys.
      - id: end-of-file-fixer # ensures that a file is either empty, or ends with one newline.
      - id: fix-byte-order-marker # removes utf-8 byte order marker.
      - id: mixed-line-ending # replaces or checks mixed line ending.
      - id: requirements-txt-fixer # sorts entries in requirements.txt.
      - id: trailing-whitespace # trims trailing whitespace.