Add simple buy example

[witchfindertr]

add simple one page subscription example code.

[RCGitBot]

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[MarkVillacampa]

Hello @witchfindertr

Have you checked out our MagicWeather sample app?

https://github.com/RevenueCat/purchases-flutter/tree/main/revenuecat_examples/MagicWeather

Is there anything specific you're looking for that's not demonstrated there?

[witchfindertr]

Hello @witchfindertr

Have you checked out our MagicWeather sample app?

https://github.com/RevenueCat/purchases-flutter/tree/main/revenuecat_examples/MagicWeather

Is there anything specific you're looking for that's not demonstrated there?

You can create a visually stunning paywall for us ? This example is bad.