Update app.py

Fix for the error: AttributeError: Custom classes or functions exported with your `Learner` not available in namespace. Re-declare/import before loading: Can't get attribute 'is_cat' on <module '__main__' from '/home/user/app/app.py'>

Update app.py

Update .gitattributes

Upload siamese.jpg

Add ipywidgets

update .gitattributes so git lfs will track .pkl files

initial commit