add pre-commit format hook

.pre-commit-config.yaml

@@ -0,0 +1,8 @@
+repos:
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: v22.1.3
+    hooks:
+      - id: clang-format
+        name: clang-format (C++)
+        files: ^src/.*\.(?:cpp|h|inc)$
+        types: [file]

README.md

@@ -62,6 +62,17 @@ Code contributions should be focused, build successfully on Windows, and include
 where practical. Because KytyPS5 is still evolving quickly, consider opening an issue before
 starting a large change.
 
+### Formatting
+
+Set up the clang-format hook after cloning:
+
+```powershell
+python -m pip install pre-commit
+python -m pre_commit install --install-hooks
+```
+
+It formats staged `.cpp`, `.h`, and `.inc` files in `src`.
+
 ## Developer Information
 
 The PS5 graphics architecture is based on AMD RDNA 2. Use AMD's