Added Flutter Animate

[BLKKKBVSIK]

Please read How to contribute before creating a submission.

Description

Submission description here

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Checklist

• [x] I read How to contribute
• [x] I edited the SOURCE.md file only
• [x] Added a link to the repo in the PR

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[KollerWithDoris]

这是来自QQ邮箱的假期自动回复邮件。您好，我最近正在休假中，无法亲自回复您的邮件。我将在假期结束后，尽快给您回复。

[denisesarona]

Wow i learned something new