Document Touch to Mouse controls and emulation possibilites

[ericoporto]

There is information here
adventuregamestudio/ags#1773

A [touch] entry can be added here with it's "emulate_mouse"
https://github.com/adventuregamestudio/ags-manual/wiki/EngineConfigFile

Not sure if we create a page about porting to mobile and add it there need to figure if this needs to be somewhere else too or not.

If we had a page for this, it would be nice having a drawing version of these gifs here
adventuregamestudio/ags#104 (comment)

[ivan-mogilko]

I added quick explanation during the latest "Default Setup" update, but maybe dedicated paragraph may still be wanted somewhere. This may be a page on porting to mobile, as you say, or a page about available game controls maybe.