docs: show --required-only in the README

scripts/generate_readme.py

@@ -788,6 +788,9 @@ def generate_readme(db: dict, platforms_dir: str, db_path: str = "database.json"
             "# Firmware only: the game data a list or a core names is left out, each file named",
             "python scripts/generate_pack.py --platform emuelec --no-game-data",
             "",
+            "# The bare minimum: only the files each core needs to start",
+            "python scripts/generate_pack.py --platform batocera --required-only",
+            "",
             "# List available emulators and systems",
             "python scripts/generate_pack.py --list-emulators",
             "python scripts/generate_pack.py --list-systems",