Add C# code examples to random_number_generation.rst

[NathanLovato]

We have a freshly-merged page about RNG: #4024

It has GDScript code examples but lacks C# equivalent. If someone would like to translate the examples to C#, it'd be a nice addition.

[graphnode]

I'm guessing Your first game tutorial should be updated too?

Since I just started: Are we supposed to use RandomNumberGenerator or the Godot.GD?

[Calinou]

Since I just started: Are we supposed to use RandomNumberGenerator or the Godot.GD?

Global-scope random functions require less boilerplate to use, but give you less control over randomization since they use a "global" random seed. See Random number generation for more information.

That said, for consistency with the GDScript code samples, use the same class as is used in GDScript. That means you should use Godot.GD in most code samples.

[raulsntos]

This seems to have been at least partially implemented by #5249, there are still a few examples that remain GDScript only and the page may have gotten outdated for both GDScript and C# by now (e.g.: it still seems to recommend to use randomize() but that's no longer necessary).

[tetrapod00]

This seems fully resolved, after #9822, #10283, and #8072.