add swiftformer

Author: brianhou0208

timm/models/__init__.py

@@ -61,6 +61,7 @@
 from .senet import *
 from .sequencer import *
 from .sknet import *
+from .swiftformer import *
 from .swin_transformer import *
 from .swin_transformer_v2 import *
 from .swin_transformer_v2_cr import *