Start work on a README for the project

README.md

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+# Chaos Game
+
+The [Chaos Game](https://en.wikipedia.org/wiki/Chaos_game) (wikipedia) is a fractal generator. This program works by iteratively walking half way between the current location (initially the center of the sprite but could be random) and a randomly selected vertex. Each time a step is made, a pixel is filled in at the destination. The color is based on the vertex's color.
+
+Right now, this program uses a hard-coded triangle and so generates a [Sierpinsky triangle](https://en.wikipedia.org/wiki/Sierpi%C5%84ski_triangle). Other shapes can be used -- see the Chaos Game Wikipedia link for examples. I have not provided a UI for altering these shapes at run time.
+
+## Building
+
+### For desktop
+
+Run `cargo run --release`, just like any other binary crate.
+
+Use `cargo run --features=dynamic_linking` for faster cycle times when modifying the code. This feature is a pass-through to Bevy's dynamic linking feature.
+
+### For WASM
+
+Run `cargo run --release --target=wasm32-unknown-unknown`. This will start a dummy webserver, *wasm-server-runner*, which in turn hosts a dummy webpage that loads the WASM file. Run the program by visiting the dummy site in your browser: [http://localhost:1334]
+
+This requires the `wasm-server-runner` crate to be installed: `cargo install wasm-server-runner`.
+
+**TODO:** A "real deployment" section.