[Textures] Mention GRM Blopost about mipmaps in index

docs/zengin/textures/index.md

@@ -25,6 +25,8 @@ By default, `.tga` files with a proper resolution are converted to `.TEX` files
 
 [Mipmaps](https://en.wikipedia.org/wiki/Mipmap) are pre-generated versions of textures at different levels of detail. They are used to improve rendering performance and reduce aliasing artifacts. When engine converts the texture it automatically generates mipmaps. Other tools may handle it differently, so it's better to check it before conversion.
 
+!!! Example "How it works?"
+    If you want to learn more about mipmaps in ZenGin there is a [great article](https://www.gothic-reloaded-mod.org/en/blog/more-than-a-texture-patch-2) by Gothic Reloaded Mod Team.
 
 ## Tools
 There are some tools created by the Gothic community, that simplify working with ZenGin textures.