Add Normal Map Bench to Texture Tools (#415)

Co-authored-by: veronicalynn0528 <252457050+veronicalynn0528@users.noreply.github.com>

README.md

@@ -128,6 +128,7 @@ _Great graphics placeholders and tools to turn that squared game into a picasso
 - :money_with_wings: [GameShipKit Sprite Normal Map](https://gameshipkit.com/tools/sprite-normal-map/) - Generate normal maps from 2D sprites for lit 2D scenes.
 - :free: [Live Normal](https://tenebrislab.github.io/livenormal/) - An Android and iOS app for generating seamless materials on the go. You take a photo, and Live Normal creates a tile-able texture and generates texture maps ready for a PBR engine of your choice.
 - :free: [Nebula Forge](https://nebulakit.itch.io/nebula-forge) - Browser-based procedural nebula background generator with adjustable controls and PNG export. Runs locally without signup.
+- :free: [Normal Map Bench](https://normalmapbench.com/) - Generate tangent-space normal maps for game textures from height images in the browser, with a live lighting preview and OpenGL or DirectX PNG export.
 - :free: [PD Sigil Forge](https://pixeldreamerstudio.itch.io/pd-sigil-forge) - Free browser generator of game-ready magic circles, xianxia formations, sci-fi holo rings, kamon crests and paper talismans for spell VFX; transparent PNG + spin sheets.
 - :moneybag: [PixPlant](https://www.pixplant.com/) - PixPlant is a smart 3D texturing tool that creates high quality normal, displacement, specular maps and seamless textures from photos.
 - :tada: [Sprite Fusion Sprite Normals](https://github.com/Hugo-Dz/spritefusion-sprite-normals) - Generate normal maps from pixel art sprites and animations.