fix(markers): allow markers to have no name

rewind/cli.py

@@ -36,7 +36,7 @@ def build_mark_parser(subparsers: argparse._SubParsersAction) -> None:
     mark_parser.add_argument(
         "-n", "--name",
         type=str,
-        required=True,
+        required=False,
         help="Name of the marker"
     )
 

rewind/core.py

@@ -55,7 +55,7 @@ def save(first_marker: str, second_marker: str):
 
 def mark(name: str) -> None:
     if not name:
-        raise ValueError("Marker name cannot be empty")
+        name = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
     
     add_marker_to_state(name)
     print(f"Added marker: {name}")