Write README

.gitattributes

@@ -0,0 +1 @@
+demo.png filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -1,3 +1,4 @@
 build/
 *.ff
 *.png
+!demo.png

README.md

@@ -1,8 +1,10 @@
 # Batomorph
 
-This is a simple raytracer, written for POSIX systems in C23 with zero
-runtime dependencies (outside of the standard library).  To build with
-CMake:
+Batomorph is a simple ray tracer, written in C23 for POSIX systems.
+
+![Demo rendering](demo.png)
+
+To build with CMake (there are no dependencies):
 
 ```sh
 cmake -B build
@@ -10,12 +12,11 @@ cmake --build build
 ```
 
 You may want to adjust the `NTHREADS` definition in `src/render.c` to
-match your system for best performance.
+match your system.
 
-When ran, the demo programs (`build/demo` and `build/rand`) will write
-the rendered image in sRGB
-[Farbfeld](https://tools.suckless.org/farbfeld/) to standard out.  For
-example:
+The demo programs (`build/demo` and `build/rand`) will write the
+rendered image in sRGB
+[Farbfeld](https://tools.suckless.org/farbfeld/) to `stdout`:
 
 ```sh
 build/demo > out.ff           # Produce Farbfeld file
@@ -24,3 +25,8 @@ build/demo | feh              # View directly
 ```
 
 (Note that `ff2png` and `feh` are third-party programs)
+
+## License
+
+Batomorph is Copyright © Camden Dixie O'Brien, and is available under
+the Komorebi 2.0.0 license.  See [LICENSE.md](LICENSE.md) for details.