add simple calculator app

nisrulz / flutter-examples

[Examples] Simple basic isolated apps, for budding flutter devs.

https://nisrulz.com/flutter-examples/

Apache License 2.0

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Open LuCCoelho opened 8 months ago

LuCCoelho commented 8 months ago

What does this implement/fix? Explain your changes Simple calculator example

Does this close any currently open issues?