Please add migration guide docs

[Husain Fadhilah]

I have to handle existing project of flutter app that previously use this package at 2.0.3+3 version but now it must be migrated to the latest one.

Currently, I am facing some problems to do so. Many changes were made without docs, like borderRadius, margin, behavior, boxShadows, horizontalDismissDirection on Flash Widget, and so many others. Please add the docs ASAP, thank you.

[sososdk]

3.x changes are big, it is recommended to check the example.

[ycy]

I have to handle existing project of flutter app that previously use this package at 2.0.3+3 version but now it must be migrated to the latest one.

Currently, I am facing some problems to do so. Many changes were made without docs, like borderRadius, margin, behavior, boxShadows, horizontalDismissDirection on Flash Widget, and so many others. Please add the docs ASAP, thank you.

Me also shocked by the incompatibility with the old version....wtf....

[vahidreza]

technically it was the worst i've ever encountered in a plugin update so far, its absolutely not backward compatible and with no proper documentation. please provide a way to address those issues.

[Kerimberdi Amanov]

@sososdk Please add migration guide like this:
https://github.com/singerdmx/flutter-quill/blob/master/doc/migration.md#from-700-to-800

[dev-thinks]

looks like completely rewritten from version 3.0+

Not able to upgrade from 2+ version. bump.