Update README.md

[J0shua-code]

added script to easily convert batch of png files to the correct 512x512 resolution keeping the original aspect ratio.
Another script to convert batch of png files to webp files.

[facebook-github-bot]

Hi @joshua-612!

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file.

In order for us to review and merge your code, please sign at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need to sign the corporate CLA.

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[aihmgmal]

Have you updated the animated stickers

[J0shua-code]

Have you updated the animated stickers

No the animated stickers are not yet supported for third party apps.
Maybe they will be when they come to stable whatsapp version

[MarvinJWendt]

Hi @joshua-612, thank you for making those scripts 👍 Unfortunately, we cannot recommend external and/or unofficial programs because WhatsApp has no control over them and cannot ensure that the linked programs will not harm users in the future.

See #431