Add README

README.md

@@ -0,0 +1,21 @@
+# 3DSrt
+
+This repository houses the 3DSrt project,
+which attempts to implement path-tracing on the PICA200,
+the GPU found on the Nintendo 3DS handheld.
+
+They say a picture's worth a thousand words, so here: ![demo image](./images/demo-image.png)
+
+## Building
+
+1. Install [devkitPro](https://devkitpro.org/wiki/Getting_Started)
+and the corresponding 3DS devkit libraries.
+2. Run `make`.
+3. Find the binary at `./3DSrt.3dsx`.
+
+## Running
+
+The easiest way to run 3DSrt is to download an emulator such as
+[Azahar](https://azahar-emu.org) to run the application,
+rather than modding an actual device (though you could do that too).
+With Azahar, select Open File and open the `3DSrt.3dsx` file from the build step.