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Add animation class

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	`1`	`+import 'package:flutter/material.dart';`
	`2`	`+import 'package:simple_animations/simple_animations.dart';`
	`3`	`+`
	`4`	`+class FadeAnimation extends StatelessWidget {`
	`5`	`+ final double delay;`
	`6`	`+ final Widget child;`
	`7`	`+`
	`8`	`+ FadeAnimation(this.delay, this.child);`
	`9`	`+`
	`10`	`+ @override`
	`11`	`+ Widget build(BuildContext context) {`
	`12`	`+ final tween = MultiTrackTween([`
	`13`	`+ Track("opacity").add(Duration(milliseconds: 500), Tween(begin: 0.0, end: 1.0)),`
	`14`	`+ Track("translateY").add(`
	`15`	`+ Duration(milliseconds: 500), Tween(begin: -30.0, end: 0.0),`
	`16`	`+ curve: Curves.easeOut)`
	`17`	`+ ]);`
	`18`	`+`
	`19`	`+ return ControlledAnimation(`
	`20`	`+ delay: Duration(milliseconds: (500 * delay).round()),`
	`21`	`+ duration: tween.duration,`
	`22`	`+ tween: tween,`
	`23`	`+ child: child,`
	`24`	`+ builderWithChild: (context, child, animation) => Opacity(`
	`25`	`+ opacity: (animation as Map)["opacity"],`
	`26`	`+ child: Transform.translate(`
	`27`	`+ offset: Offset(0, (animation as Map)["translateY"]),`
	`28`	`+ child: child`
	`29`	`+ ),`
	`30`	`+ ),`
	`31`	`+ );`
	`32`	`+ }`
	`33`	`+}`

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