pre-commit: init

.pre-commit-config.yaml

+repos:
+-   repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: v13.0.1
+    hooks:
+    -   id: clang-format
+        args: [-i, --style=Google]
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.1.0
+    hooks:
+    -   id: trailing-whitespace