[add] tutorial for instanced rendering demo.

Author: vmarcella

docs/tutorials/README.md

@@ -3,28 +3,30 @@ title: "Tutorials Index"
 document_id: "tutorials-index-2025-10-17"
 status: "living"
 created: "2025-10-17T00:20:00Z"
-last_updated: "2025-11-17T00:00:00Z"
-version: "0.3.0"
+last_updated: "2025-11-25T00:00:00Z"
+version: "0.4.0"
 engine_workspace_version: "2023.1.30"
 wgpu_version: "26.0.1"
 shader_backend_default: "naga"
 winit_version: "0.29.10"
-repo_commit: "ceaf345777d871912b2f92ae629a34b8e6f8654a"
+repo_commit: "2ff0a581af014a754e982881193c36f47e685602"
 owners: ["lambda-sh"]
 reviewers: ["engine", "rendering"]
 tags: ["index", "tutorials", "docs"]
 ---
 
-This index lists tutorials that teach specific engine tasks through complete, incremental builds.
+This index lists tutorials that teach specific `lambda-rs` tasks through complete, incremental builds.
 
 - Uniform Buffers: Build a Spinning Triangle — [uniform-buffers.md](uniform-buffers.md)
 - Textured Quad: Sample a 2D Texture — [textured-quad.md](textured-quad.md)
 - Textured Cube: 3D Push Constants + 2D Sampling — [textured-cube.md](textured-cube.md)
 - Reflective Room: Stencil Masked Reflections with MSAA — [reflective-room.md](reflective-room.md)
+-, Instanced Rendering: Grid of Colored Quads — [instanced-quads.md](instanced-quads.md)
 
 Browse all tutorials in this directory.
 
 Changelog
+- 0.4.0 (2025-11-25): Add Instanced Quads tutorial; update metadata and commit.
 - 0.3.0 (2025-11-17): Add Reflective Room tutorial; update metadata and commit.
 - 0.2.0 (2025-11-10): Add links for textured quad and textured cube; update metadata and commit.
 - 0.1.0 (2025-10-17): Initial index with uniform buffers tutorial.