Adding enum.

Signed-off-by: Cliff Hill <xlorep@darkhelm.org>

backend/src/playlist/enum.py

@@ -0,0 +1,22 @@
+"""All enums for the project are kept here."""
+
+from enum import StrEnum
+from enum import auto
+
+
+class Sublist(StrEnum):
+    """StrEnum to categorize tracks within a playlist based on various criteria.
+
+    Values are auto-generated.
+
+    Attributes:
+        LEAST_RECENTLY_ADDED: Represents tracks that were added to the library the earliest.
+        LEAST_RECENTLY_PLAYED: Represents tracks that were last played the longest time ago.
+        LEAST_OFTEN_PLAYED: Represents tracks that have been played the least often.
+        RANDOM: Represents tracks that are selected randomly.
+    """
+
+    LEAST_RECENTLY_ADDED = auto()
+    LEAST_RECENTLY_PLAYED = auto()
+    LEAST_OFTEN_PLAYED = auto()
+    RANDOM = auto()