Add RegNet (#13)

Author: james77777778

kimm/models/__init__.py

@@ -6,5 +6,6 @@
 from kimm.models.mobilenet_v2 import *  # noqa:F403
 from kimm.models.mobilenet_v3 import *  # noqa:F403
 from kimm.models.mobilevit import *  # noqa:F403
+from kimm.models.regnet import *  # noqa:F403
 from kimm.models.resnet import *  # noqa:F403
 from kimm.models.vision_transformer import *  # noqa:F403