Add pre-commit config

.pre-commit-config.yaml

@@ -0,0 +1,24 @@
+---
+repos:
+  - repo: meta
+    hooks:
+      - id: check-hooks-apply
+      - id: check-useless-excludes
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.1.0
+    hooks:
+      - id: check-merge-conflict
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+        args: [--markdown-linebreak-ext=md]
+
+  - repo: https://github.com/executablebooks/mdformat
+    rev: 0.7.13
+    hooks:
+      - id: mdformat
+        additional_dependencies:
+          - mdformat-gfm
+          - mdformat-toc
+
+# EOF