Added screenshot page

Author: cschreib

README.md

@@ -6,7 +6,7 @@
     - [In a nutshell](#in-a-nutshell)
     - [Available GUI widgets](#available-gui-widgets)
     - [Demonstration](#demonstration)
-    - [Mandatory screenshot](#mandatory-screenshot)
+    - [Gallery](#gallery)
     - [Front-end and back-ends](#front-end-and-back-ends)
     - [Configurable rendering options](#configurable-rendering-options)
 - [Getting started](#getting-started)
@@ -65,7 +65,9 @@ A WebAssembly live demo is accessible on-line [here](https://cschreib.github.io/
 Included in the source package (in the `gui/test` directory) is a test program that should compile and work fine if you have installed the whole thing properly. It is supposed to render exactly as the sample screenshot below. It can also serve as a demo program, and you can see for yourself what the XML and Lua code looks like for larger scale GUIs.
 
 
-## Mandatory screenshot
+## Gallery
+
+Please head to the [screenshots page](screenshots/screenshots.md) for examples of lxgui being used in real-world projects.
 
 Below is a screenshot of the test program included with the library (the same interface is displayed in the live demo linked above). It is meant to test and demonstrate most of the features available in the library. Note that the "look-and-feel" displayed here is purely for demonstration; every element of the interface (colors, dialog shapes and style) is defined in fully customizable Lua and XML files.
 

screenshots/001.png

@@ -0,0 +1,13 @@
+# Screenshots
+
+This page gathers all screenshots of lxgui being used by other projects. If you have an entry you would like to add to this page, please open an issue on github and upload your own screenshot with a description following the examples below!
+
+## Unreleased game
+
+* Author: @cschreib
+* Date: 23/10/2021
+* lxgui: main (328a259cb1b4d5153c80bf55fab5fc8948a61c9d)
+* Url: Not available
+* Description: Yet unreleased video game project. The screenshot demonstrates most of the UI elements on a single screen. This is all built with standard lxgui, except the "world frames" (small insets in the two leftmost windows, rendering a region of the game world on top of UI elements). The 2D rendering of the world elements is also done using lxgui's renderer.
+
+![Unreleased game](001.png)