update README

README.md

@@ -1,6 +1,8 @@
 # WebGPU Raytracing
 
-A raytracer program, which follows [raytracing.github.io](https://raytracing.github.io/) course.
+🚧 **work in progress** 🚧
+
+A ray tracer program based on [WebGPU API](https://developer.mozilla.org/en-US/docs/Web/API/WebGPU_API)
 
 ## Prerequisites
 
@@ -19,3 +21,11 @@ Run the development server:
 ```sh
 bun run dev
 ```
+
+## Learning materials
+
+Here's some learning materials useful for learning the ray tracing:
+
+- 📹 [The Cherno - Ray Tracing series](https://www.youtube.com/playlist?list=PLlrATfBNZ98edc5GshdBtREv5asFW3yXl)
+- 📘 [Ray Tracing in One Weekend](https://raytracing.github.io/)
+- 📕 [Scratchapixel lessons](https://www.scratchapixel.com/)