add pre-commit helper

Author: jcarpent

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+repos:
+-   repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: 'v13.0.1'  # Use the sha / tag you want to point at
+    hooks:
+    -   id: clang-format
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+    -   id: trailing-whitespace