function AddResourceAction(resource, manager, category)
{
	Action.call(this);
	
	this.resource = resource;
	this.manager = manager;
	this.category = category;
}
Add resource to the resource manager.

@class AddResourceAction
@param {Resource} resource Resource to add.
@param {ResourceManager} manager Manager to insert the resource into.
@param {string} category Category of the resource.