feat: add Sprite Fusion, a free tilemap editor

Author: Hugo-Dz

README.md

@@ -112,6 +112,7 @@ _Great graphics placeholders and tools to turn that squared game into a picasso
 
 #### Tile/Level Editors
 
+- :free: [Sprite Fusion](https://spritefusion.com/) - A free level design tool to craft beautiful 2D tilemaps right in your browser using any tileset.
 - :moneybag: [AutoTileGen](http://pixelatto.com) - AutoTileGen is an automatic tileset generator for 2D game terrains.
 - :tada: [LDtk](https://deepnight.net/tools/ldtk-2d-level-editor/) - LDtk is an open-source 2D level editor for indie devs, with a strong focus on user-friendliness.
 - :tada: [Material Maker](https://github.com/RodZill4/material-maker) - procedural texture creator made in Godot