[FAQ] Is it possible to install simple gems? If not, how to simulate doing so?

I suggest a new FAQ entry e. g. dealing with ruby gems via ruby.wasm.

Now, I assume right now this is not possible - that is ok. Please mention it in the FAQ.

But ... let's assume that some gems are simple.

Like a hello world gem:

class HelloWorld
  def initialize
  end
  def result?
    'Hello world!'
  end
end

So we can use the ruby.wasm .write() method onto result? (or any other
method name that is similar, this here is just an example).

Such code should work just fine. Just that it may be stored in a .gem file.

Is there a way to get support for that? In such a simple case we can probably
just embed the text (content of hello_world.rb) into the String that is evaluated,
so just File.read() should suffice. But I wonder whether there is some official
support for this via ruby.wasm. Many simple gems could be made to work
that way. (Of course other gems that are more complicated or require
Thread may not work, but perhaps in the future.)

Review the existing FAQ and the ruby.wasm gem support described in the issue. Establish whether simple gems can be installed or simulated through embedded Ruby source and File.read(), then document the supported approach, limitations, and an example for the HelloWorld case.