Add pre-commit hook

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: trailing-whitespace
+        args: [--markdown-linebreak-ext=md]   # сохранить двойной пробел в markdown как перенос
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+        args: [--fix=lf]