Suggest Adding Installation Note for v2 in README

[EhsanGhafoori]

Hi 👋

Thanks for the great package!

I noticed that trying to install version 2 using the common pattern:

composer require wire-elements/modal:^2.0
But Composer throws this error:

- Root composer.json requires wire-elements/modal 2.0, but no stable 2.0.0 version is available.
fails because there is no stable 2.0.0 tag yet. Composer expects an exact stable version, and since only pre-releases like 2.0.13 exist, it throws an error.

To avoid confusion for others, I suggest adding a note in the README like:

If you want to install v2, just run:
composer require wire-elements/modal
Or mention the need to use @beta if someone wants to stick with version constraints:
composer require wire-elements/modal:"^2.0@beta"

Thanks again for your work! 🙌