Classify static and smart crates

serato_doctor/models/crate.py

@@ -1,13 +1,21 @@
 from dataclasses import dataclass
+from enum import Enum
 from pathlib import Path
 from typing import Tuple
 
 from serato_doctor.models.reference import TrackReference
 
 
+class CrateKind(str, Enum):
+    STATIC = "static"
+    SMART = "smart"
+    UNKNOWN = "unknown"
+
+
 @dataclass(frozen=True)
 class Crate:
     """A Serato crate and the track references parsed from it."""
 
     path: Path
     references: Tuple[TrackReference, ...]
+    kind: CrateKind = CrateKind.UNKNOWN