Add simpler examples

[Toby222]

Is your feature request related to a problem? Please describe.
The examples tend to be slightly over-complicated. The "hello_world" example has 3 dependencies, all with custom feature-sets, the "hello_world_simple" example only drops the image.

Describe the solution you'd like
A set of more basic examples.
E.g. a "hello world" that is strictly a text label for "Hello world", to make it more approachable for new users to understand what each part does.
A new user, or someone new to Rust will very likely not clone the egui repository just to run the examples, but will copy-paste the examples' source code to their own crate, only to be faced with unexpected -and unnecessary- missing modules.

Additional context

[rustbasic]

How about creating and maintaining a repository for egui examples?

[YgorSouza]

#3622 is trying to address this.

[Toby222]

There's also been no activity in that issue (barring yours just then) basically since it was first opened ^^;

[rustbasic]

@Toby222 @YgorSouza

I don’t think you need to think about it too hard.

Just open 'Repository' and merge all examples provided with the Pull Request.
If it's not a hack, just ignore the bug and merge.

It's a simple task, but rustbasic or emilk seem to have limitations in stamina.

Is there anyone who wants to try it?

[Agent-E11]

@Toby222 @YgorSouza

There's also been no activity in that issue (barring yours just then) basically since it was first opened ^^;

Yes, I originally opened the issue, but unfortunately I no longer have enough time to work on it.