request: add a Flutter application example

[alestiago]

Is there an existing feature request for this?

• I have searched the existing issues.

Command

Add a Flutter application example.

Description

Instead of a plain markdown file (https://github.com/Betterment/alchemist/blob/main/example/example.md), it would be great to have a real Flutter example application.

It would be ideal if this example showcased the functionality Alchemist provides. For example, showing a login page with goldens for different languages with a custom font.

Reasoning

• Makes it easier for other developers to pick up the package.
• Allows catching issues from the example (eg fix: load fonts from other packages correctly #55).
• Easily allow testing changes (while developing) against a real codebase

Additional context and comments

No response

[jeroen-meijer]

Example project has been built in my fork here.

Note that the included goldens will need to be regenerated once #55 is merged.

[jeroen-meijer]

Implemented in #57