Add more animated texts to the package

Reference: https://tobiasahlin.com/moving-letters/

If you want to work on any animation follow these steps.

1. Open an issue with the link of animation
2. Open a PR
3. Get it merged!

The package is for Flutter text animations. First, explore the lib/ directory to see existing animation widgets like RotateAnimatedTextKit. The reference link shows CSS animations; you'll need to translate one into a new Dart widget. Check test/ for examples, then create a new widget following the pattern of existing ones. 'Done' means a new animation widget is added and a simple example works.

Rédigé par le modèle d'indexation à partir du texte de l'issue.