Add licences page

Author: dwursteisen

tiny-doc/src/docs/asciidoc/index.adoc

@@ -51,3 +51,5 @@ include::dependencies/tiny-api.adoc[]
 
 - https://tomhalligan.substack.com/p/tinkering-with-tiny[Tinkering with Tiny]
 - https://tomhalligan.substack.com/p/tiny-gardening[Tiny Gardening]
+
+include::licences.adoc[]

tiny-doc/src/docs/asciidoc/licences.adoc

@@ -0,0 +1,18 @@
+== Licences
+
+This documentation is using assets from https://www.kenney.nl.
+Please find below the licences regarding those assets.
+
+- https://www.kenney.nl/assets/tiny-town[Tiny Town (1.0)]
+- https://www.kenney.nl/assets/tiny-battle[Tiny Battle (1.0)]
+- https://www.kenney.nl/assets/tiny-dungeon[Tiny Dungeon (1.0)]
+- https://www.kenney.nl/assets/pixel-platformer[Pixel Platformer (1.2)]
+
+------------------------------
+License: (Creative Commons Zero, CC0)
+http://creativecommons.org/publicdomain/zero/1.0/
+
+This content is free to use in personal, educational and commercial projects.
+
+Support us by crediting Kenney or www.kenney.nl (this is not mandatory)
+------------------------------