Add state flip task to Single-Qubit Gates kata

[WWhitedogi]

Add state flip task to Single Qubit Gates

[WWhitedogi]

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[tcNickolas]

Looks great! I suggested a few small formatting improvements (you can just click "accept suggestions" on them for simplicity) and a file rename to make sure the build passes on all platforms.

Thank you!

[tcNickolas]

Looks great, thank you!