Add a pre-commit config.

Author: Julian

.pre-commit-config.yaml

@@ -0,0 +1,19 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.3.0
+    hooks:
+      - id: check-ast
+      - id: check-docstring-first
+      - id: check-json
+      - id: check-toml
+      - id: check-vcs-permalinks
+      - id: check-yaml
+      - id: debug-statements
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+        args: [--fix, lf]
+      - id: trailing-whitespace
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.10.1
+    hooks:
+    -   id: isort