Add note about how to compile the app in release mode

README.md

@@ -11,6 +11,9 @@ A microtonal scale research app chiefly dedicated to ternary scales (scales with
 1. Run `npm run serve` in the project directory.
 1. Visit `http://localhost:8080/` with your browser. Your browser must support WebAssembly; all major browsers should.
 
+
+By default the WASM is compiled in development mode. To compile it in release mode, change the `mode` value to `"production"` in the project directory's `webpack.config.js` file.
+
 # Dev scripts
 
 1. `npm run build`: Build the app