add README

README.md

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+# rakugaki - digital multiplayer graffiti
+
+rakugaki is a multiplayer paint canvas with programmable brushes!
+
+At the heart of rakugaki is the _brush_ - a little program for manipulating pixels on a _wall_.
+Brushes are written in a tiny programming language called _haku_.
+
+## I wanna try it out!
+
+Since the app is currently in very early alpha stages, there's no public instance at the moment.
+
+You're free to spin up a server for your friends though!
+Here's the setup procedure for production instances.
+
+```sh
+# As of writing this, 1.81 is not yet released, so we have to use Rust nightly.
+rustup toolchain install nightly-2024-08-11
+rustup default nightly-2024-08-11
+rustup target add wasm32-unknown-unknown
+
+# We use `just` to wrangle the process of building the client-side WebAssembly and the server.
+cargo install just
+
+# Now it's time to run
+just port=8080 profile=release
+```
+
+For development, I recommend using `cargo watch` for live reloading.
+`just` defaults to a development configuration.
+
+```sh
+cargo install cargo-watch
+cargo watch -- just
+```
+