setAssetsFolder(string path)
Sets the folder where all of your assets should reside, so that Qiso knows where to load them in from. The following example tells Qiso to look in a folder named "assets" and then load in a sample-tilemap.tmx map from that folder.
local qiso = require "plugin.qisoengine"
qiso.setAssetsFolder("assets")
qiso.loadTiledMap("sample-tilemap")