Create page.md for audio sample

[Dageus]

Problem

Missing page.md for audio sample

[RiscadoA]

Could you pick this up before moving on from the audio? @diogomsmiranda
Should be quick, and I think it's better that it gets documented by either you or @Dageus ASAP, as you guys have more knowledge about the audio plugin

[diogomsmiranda]

This issue was left open by mistake, as we already added a sample page to the audio sample.

Feel free to answer this if there's something we should change.

I see now that we left the header example audio sample on the title... maybe we can push something to fix that.

[RiscadoA]

This issue was left open by mistake, as we already added a sample page to the audio sample.

Feel free to answer this if there's something we should change.

@diogomsmiranda
It's not showing up here: https://docs.cubosengine.org/examples-engine.html
I think you added the sample source code, but there's no actual sample page