add __init__ files

main.py

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+hello_world = lambda: "Hello, World!"
+
+print(hello_world())

src/logic/__init__.py

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+__help__ = "This package contains the logic of the application."

src/ui/__init__.py

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+from .sources 

src/ui/sources/__init__.py

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+# all .ui files and their corresponding python files are stored here.
+# The corresponding classes used in the program are defined here and used in the ui dir.