Animated Webp encoder

[zfangqijun]

I found decodeAnimated but did not find encodeAnimated.

[jamsinclair]

Thanks @zfangqijun. Currently there is no plan to implement encodeAnimated.

If anyone would like to contribute these changes or finish off the existing #74 branch, that would be greatly appreciated! Happy to help support.

[zfangqijun]

Thanks @zfangqijun. Currently there is no plan to implement encodeAnimated.

If anyone would like to contribute these changes or finish off the existing #74 branch, that would be greatly appreciated! Happy to help support.

Thanks. I'm not very familiar with it, but I can give it a try.