Multilabel support & Label refactoring (#17)

Reviewed-on: moritz/ptouch-prnt#17

hooks/README.md

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+# Git Hooks
+
+This directory contains git hooks for the ptouch-prnt repository.
+
+## Installation
+
+To install the hooks, run:
+
+```bash
+./hooks/install_hooks.sh
+```
+
+This will copy all hooks from this directory to `.git/hooks/` and make them executable.
+
+## Available Hooks
+
+### pre-commit
+
+The pre-commit hook automatically updates copyright headers in source files before each commit.
+
+**What it does:**
+- Runs `scripts/update_copyright.sh` to update copyright years in source files
+- Automatically re-stages any modified files
+- Ensures copyright headers are always up-to-date
+
+**Requirements:**
+- `scripts/update_copyright.sh` must exist and be executable
+
+## Skipping Hooks
+
+If you need to skip the pre-commit hook for a specific commit (not recommended), use:
+
+```bash
+git commit --no-verify
+```
+
+## Uninstalling
+
+To remove a hook, simply delete it from `.git/hooks/`:
+
+```bash
+rm .git/hooks/pre-commit
+```