Add pre-commit hooks

.pre-commit-config.yaml

+# Config based on https://gitlab.com/octopus-code/postopus/-/blob/main/.pre-commit-config.yaml
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v4.4.0
+  hooks:
+  - id: trailing-whitespace
+  - id: check-ast
+  - id: check-docstring-first
+  - id: check-executables-have-shebangs
+  - id: check-json
+  - id: check-merge-conflict
+  - id: check-xml
+  - id: check-yaml
+  - id: check-toml
+  - id: debug-statements
+  - id: end-of-file-fixer
+  - id: requirements-txt-fixer
+  - id: mixed-line-ending
+    args: ['--fix=auto']  # replace 'auto' with 'lf' to enforce Linux/Mac line endings or 'crlf' for Windows
+
+# other hooks
+# Ruff:
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  # Ruff version.
+  rev: v0.0.269
+  hooks:
+    - id: ruff
+      args: [--fix, --exit-non-zero-on-fix]
+
+# Black
+- repo: https://github.com/psf/black
+  rev: 23.3.0
+  hooks:
+  - id: black
+    language_version: python3
+
+## If like to embrace black styles even in the docs:
+# - repo: https://github.com/asottile/blacken-docs
+#   rev: v1.9.1
+#   hooks:
+#   - id: blacken-docs
+#     additional_dependencies: [black]
+
+# pydocstyle
+- repo: https://github.com/PyCQA/pydocstyle
+  rev: 6.3.0
+  hooks:
+  -   id: pydocstyle
+      name: pydocstyle
+      description: pydocstyle is a static analysis tool for checking compliance with Python docstring conventions.
+      entry: pydocstyle
+      language: python
+      types: [python]
+
+- repo: https://github.com/abravalheri/validate-pyproject
+  rev: v0.10.1
+  hooks:
+    - id: validate-pyproject