Add pre-commit hooks.

Author: HexDecimal

.pre-commit-config.yaml

@@ -0,0 +1,26 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files
+      - id: check-shebang-scripts-are-executable
+      - id: check-merge-conflict
+      - id: check-toml
+      - id: debug-statements
+      - id: fix-byte-order-marker
+      - id: detect-private-key
+  - repo: https://github.com/psf/black
+    rev: 23.3.0
+    hooks:
+      - id: black
+  - repo: https://github.com/pycqa/isort
+    rev: 5.12.0
+    hooks:
+      - id: isort
+default_language_version:
+  python: python3.11

CONTRIBUTING.md

@@ -1,10 +1,12 @@
 ## Code style
 
-New and refactored Python code should follow the
-[PEP 8](https://www.python.org/dev/peps/pep-0008/) guidelines.
+Code styles are enforced using black and linters.
+These are best enabled with a pre-commit which you can setup with:
 
-It's recommended to use an editor supporting
-[EditorConfig](https://editorconfig.org/).
+```sh
+pip install pre-commit
+pre-commit install
+```
 
 ## Building python-tcod