add preliminary instructions on how to build for web assembly

README.md

@@ -118,6 +118,23 @@ cd outfly
 cargo run --release
 ```
 
+## Building for WASM/Browser
+
+This is a work in progress, for now these are just some general hints:
+
+```
+git clone [URL]
+cd outfly
+rustup target install wasm32-unknown-unknown
+pacman -S wasm-bindgen binaryen
+mkdir outfly_wasm
+cargo build --release --target wasm32-unknown-unknown
+wasm-bindgen --out-name outfly --out-dir outfly_wasm --target web target/wasm32-unknown-unknown/release/outfly.wasm
+wasm-opt -Oz --output wasm/outfly_bg.wasm wasm/outfly_bg.wasm
+echo '<script type="module">import init from "./outfly.js"; init()</script>' > wasm/index.html
+python -m http.server -d wasm
+```
+
 # Changelog
 
 - v0.5.2: