pre-commit: add basic hooks

Signed-off-by: Maciej Pijanowski <maciej.pijanowski@3mdeb.com>

.pre-commit-config.yaml

@@ -0,0 +1,12 @@
+---
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.1.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-merge-conflict
+      - id: check-symlinks
+      - id: detect-private-key
+      - id: end-of-file-fixer
+      - id: trailing-whitespace

README.md

@@ -33,3 +33,22 @@ mkdocs.yml)
 - TBD or TODO is visible on website
 
 There should be no TBD or TODO visible on website.
+
+# pre-commit hooks
+
+* [Install pre-commit](https://pre-commit.com/index.html#install)
+
+* Install hooks into repo:
+
+```
+pre-commit install
+```
+
+* Enjoy automatic checks on each `git commit` action!
+
+* (Optional) Run hooks on all files (for example, when adding new hooks or
+  configuring existing ones):
+
+```bash
+pre-commit run --all-files
+```