custom curves

[gsantiago]

First of all, thanks for the great library! It saved us a lot of time!

But there is a feature it would be great to have: "custom curves".

I'd like to customize the curves for my project. However, I noticed the lib doesn't have any prop to do so.

We could create two props named getPathUp and getPathDown. In these props, we can pass or own paths. It could be something like this:

<CurvedBottomBar.Navigator 
  {...otherProps}
  getPathDown={myCustomPathDown}
/>

What do you think about this, @hoaphantn7604? If you like the idea, I can soon open a PR

[XChikuX]

@hoaphantn7604 This sounds like a great idea. Please review their PR