Add demo folder

.gitignore

@@ -5,5 +5,6 @@ composer.lock
 !/datas/.gitkeep
 /public/photos/*
 !/public/photos/.gitkeep
+!/public/photos/Demo
 /cache/*
 !/cache/.gitkeep

public/photos/Demo/Birds/Bee_hummingbird_(Mellisuga_helenae)_immature_male.jpg.md

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+**Description** : Bee hummingbird (Mellisuga helenae) immature male, Cuba
+
+**Date** 	20 February 2016, 15:33:06
+
+**Source** 	Own work, from Sharp Photography, sharpphotography
+
+**From** : [Wikipedia](https://en.wikipedia.org/wiki/File:Bee_hummingbird_(Mellisuga_helenae)_immature_male.jpg)
+
+**Author** : [Charles J. Sharp](https://www.wikidata.org/wiki/Q54800218)

public/photos/Demo/Birds/European_starling_at_Bodega_Head-1209.jpg.md

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+**Description**: European starling (Sturnus vulgaris) perched on a wooden pole near the Bodega Head parking lot, Sonoma County, California, on December 2, 2022.
+
+**Date** : 2 December 2022, 13:31:25
+
+**Source** : Own work
+
+**From** : [Wikipedia](https://en.wikipedia.org/wiki/File:European_starling_at_Bodega_Head-1209.jpg)
+
+**Author** : [Frank Schulenburg](https://www.wikidata.org/wiki/Q57175365)
+
+**Attribution** : © Frank Schulenburg / [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)

public/photos/Demo/Birds/note.md

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+## A few birds
+
+Here are some photos of birds from Wikipedia.

public/photos/Demo/note.md

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+## Demo
+
+Here is an example of text you can display as an introduction to a gallery.
+
+To display this message, simply create a text file named `note.md` in the root of your gallery directory. You can then write its content in [Markdown](https://en.wikipedia.org/wiki/Markdown) using any text editor.
+
+To customize the folder image, simply place an image file in the root of your gallery and name it `folder.jpg`.
+
+
+### Don't remove this folder
+
+For hidding the demo folder, edit your config file (datas/config.php) and add `Demo` in `skipObjects`.
+
+[Nanogal documentation](https://forge.leslibres.org/Knah-Tsaeb/NanoGal)
+
+---
+
+For this demo, we use [2014-04-29 01 Northwestern crow (Corvus brachyrhynchos caurinus).jpg from Wikipedia](https://commons.wikimedia.org/wiki/File:2014-04-29_01_Northwestern_crow_(Corvus_brachyrhynchos_caurinus).jpg);
+
+Attribution : [Gordon Leggett](https://commons.wikimedia.org/wiki/User:GRDN711) / Wikimedia Commons / CC BY-SA 4.0