Should the new template include Custom Theming of the app?

While building a flutter application implementing a proper theme can be difficult I believe, a developer should not change the only primary color, there are many things that need to be taken care of.

Here is an example that I follow for building the custom theme In my Apps.

In a separate class defining the required themes (let's say Dark/Light modes) and adding the required theme attributes over there and mostly we are going to deal with the colors so we can have them in the separate file + class.

The issue proposes adding custom light and dark theming to the Flutter template but names no files, entry points, or tests. Start by reviewing the template's current theme setup and determine which theme attributes and modes are in scope. Done should mean the template includes a clearly defined, reusable custom theme rather than only changing the primary color.

Written by the indexing model from the issue text.