Adds iOS shake animation

[anthony0030]

Signed-off-by: Anthony Veaudry anthony@veaudry.pro

[eltonmesquita]

Thanks for the PR @anthony0030. Please read our contributing section:

Pull requests are the way to go here. We only have two rules for submitting a pull request: match the naming convention (camelCase, categorised [fades, bounces, etc]) and let us see a demo of submitted animations in a pen.

[anthony0030]

Thanks @eltonmesquita ,

It would be great to add that a pen is required in the CONTRIBUTING.md.

Here is the pen: https://codepen.io/anthony0030/pen/ExPBexv

Thanks again for your time :)

[eltonmesquita]

Thanks for the pen! I appreciate the hard work. 😃

Honestly, I think this looks way too much with our current tada animation. At the moment I don't see why to merge it. About the contribution guide, you're right, it's missing in the guide. You'd like to send a PR fixing that?

[anthony0030]

I can agree it is similar but more subtle, it is an animation I use in conjunction with animate.css on some of my projects.
What I do is if I have a useful code addition I make a pull request to the repo that the code is for. That way others can use the same code, I can just install the npm package without copying the code to every new repo I need to use it in and the best scenario is someone improves my code. Here is the pull request for the documentation you asked me for #1089

[daneden]

Hey @anthony0030! I think I have to side with @eltonmesquita here; this animation seems too similar to current ones in Animate.css, including tada and shakeX. I’m going to close this PR. I appreciate the submission, but thanks for also updating the contributor guidelines in #1089!