Add GraphicsGale page

docs/Tools/GraphicsGale/README.md

@@ -0,0 +1,16 @@
+# GraphicsGale
+
+GraphicsGale (also known as Gale) is an image editing program tailored towards pixel art, written by HUMANBALANCE Ltd. The software includes features such as onion skin, real-time preview for GIF animations, batch conversion, and editing Windows icon (ICO) and cursor (CUR) files. GraphicsGale was originally released as paid software in 2004 before being released as freeware in 2017.
+
+[:fontawesome-solid-download: Download](https://graphicsgale.com/us/download.html){ .md-button .md-button--primary }
+[:fontawesome-solid-globe: Website](https://graphicsgale.com/us/){ .md-button target="_blank" }
+
+## Retro Engine
+
+GraphicsGale was used by Christian Whitehead for handling most graphic assets when working with Retro Engine games, and is still a common choice for sprite editing among RSDK modders. The main reason for this is that, unlike most other graphics editors, GraphicsGale supports indexed color palettes for GIF files, with palette optimization being disabled by default. This allows for easily modifying palettes for spritesheets and saving files without the palettes getting scrambled or merged.
+
+TODO: Is there a better way to make a horizontally aligned images with captions?
+
+| ![Original color palette](/assets/images/GraphicsGale/Palettes/S1-Sonic1.png) | ![Palette after saved through GraphicsGale](/assets/images/GraphicsGale/Palettes/S1-Sonic1.png) | ![Palette after saved through paint.net](/assets/images/GraphicsGale/Palettes/S1-Sonic1-PDN.png) |
+| :---------------------------------------------------------------------------: | :---------------------------------------------------------------------------------------------: | :----------------------------------------------------------------------------------------------: |
+| Original color palette                                                        | Palette after saved through GraphicsGale                                                        | Palette after saved through paint.net                                                            |

mkdocs.yml

@@ -501,6 +501,7 @@ nav:
     - RetroED: Tools/RetroED/README.md
     - S3KOEditorLink: Tools/S3KOEditorLink/README.md
     - RSDK Animation Editor: Tools/RSDK-Anim-Editor/README.md
+    - GraphicsGale: Tools/GraphicsGale/README.md
 
   - Guides:
     - Guides/README.md