Add README and license

README.md

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+# GPU Renderer
+
+A (very) WIP GPU-accelerated renderer using Vulkan, capable of
+animating rigged (GLB) models and drawing shadows.
+
+![Screenshot](./cesium-man-screenshot.png)
+
+I mostly made this to learn about GPU-accelerated 3D rendering, so
+it's not the most tidy, and probably not particular reliable or
+performant.
+
+## Building and Running
+
+The only runtime dependencies are Vulkan and GLFW.  For building,
+you'll need the development headers for those, along with CMake, a
+GLSL compiler and a C23 toolchain.
+
+Given those are available, the project can be build with:
+
+```
+cmake -B build
+cmake --build build
+```
+
+This should produce a demo binary `build/demo`, which can be ran
+passing a GLB model as the first argument:
+
+```
+build/model CesiumMan.glb
+```
+
+## License and Copyright
+
+Copyright © Camden Dixie O'Brien, and is available under the Komorebi
+2.0.0 license. See [LICENSE.md](./LICENSE.md) for details.