add link to layar app

[leobard]

There is a mention in https://www.semantic-web-journal.net/content/linkedgeodata-core-web-spatial-open-data of a mobile app based on layar https://layar.com/. At layar, they forward to blipbuilder.

If the app still exists, link it from linkedgeodata.org menu.

Reason: end-user applications would make end users benefit from the semantic web. That would motivate more developers to provide apps and more publishers to contribute data.

Edit: as the paper is from 2012, and the app from 2012, the layar app may not be maintained anymore. Still, such app would be highly relevant still today for the purpose of generating a positive feedback look of using & creating LinkedGeoData

Edit: even more relevant today as I prefer the web and 3-dimensional cyberspace and augmented reality to be open and not to be a proprietary show by a single player like "meta".