Add instructions on how to add a ROM file

README.md

@@ -6,7 +6,7 @@ A React-based web UI for [JSNES](https://github.com/bfirsh/jsnes).
 
     $ yarn install
     $ yarn start
-    
+
 ## Building for production
 
     $ yarn build
@@ -24,3 +24,15 @@ All code must conform to [Prettier](https://prettier.io/) formatting. The test s
 To automatically format all your code, run:
 
     $ yarn run format
+
+## Adding roms
+
+Open `src/config.js` and add a new key under the defined `config.ROMS`. For example:
+
+    myrom: {
+      name: "My Rom",
+      description: <span>This is my own homebrew NES rom</span>,
+      url: "http://localhost:3000/roms/myrom/myrom.nes"
+    }
+
+If you add your rom file now under `public/roms/myrom/myrom.nes`, the game should start playing as you navigate to http://localhost:3000/myrom