Revert "Remove PhotoLight"

This reverts commit a75cc4a3c8.

README.md

@@ -1170,6 +1170,7 @@ See also _[Monitoring](#monitoring)_
 - [OwnPhotos](https://github.com/hooram/ownphotos) - Self hosted wannabe Google Photos clone, with a slight focus on cool graphs. `MIT` `Python`
 - [Photato](https://github.com/trebonius0/Photato) - Self-hosted photo gallery, accessible through a responsive WebUI. Directly uses and indexes a specific folder in the filesystem. `AGPL-3.0` `Java`
 - [Photofloat](http://blog.zx2c4.com/567) - Web 2.0 Photo Gallery Done Right via Static JSON and Dynamic Javascript. ([Demo](http://photos.jasondonenfeld.com/)) `GPL-2.0` `Python`
+- [PhotoLight](https://github.com/thibaud-rohmer/PhotoLight) - The easiest photo gallery there is. `GPL-3.0` `PHP`
 - [Photonix](https://photonix.org/) - A new web-based photo management application with object recognition, location awareness, color analysis and other ML algorithms. ([Demo](https://demo.photonix.org/), [Source Code](https://github.com/damianmoore/photonix)) `AGPL-3.0` `Python`
 - [PhotoPrism](https://photoprism.org) - Personal photo management powered by Go and Google TensorFlow.  Browse, organize, and share your personal photo collection, using the latest technologies to automatically tag and find pictures. ([Source Code](https://github.com/photoprism/photoprism)) `MIT` `Go`
 - [Piwigo](http://piwigo.org/) - Photo gallery software for the web, built by an active community of users and developers. ([Demo](http://piwigo.org/demo/), [Source Code](https://github.com/Piwigo/Piwigo)) `GPL-2.0` `PHP`