Add README

README.md

@@ -0,0 +1,31 @@
+# t2-model-skinner
+
+[Launch the app!](https://exogen.github.io/t2-model-skinner/)
+
+## Development
+
+Clone the repository and run:
+
+```console
+$ npm install
+```
+
+Then run `npm start` to launch the development server:
+
+```console
+$ npm start
+```
+
+Build the production version of the app with `npm run build`:
+
+```console
+$ npm run build
+```
+
+You will also need to clone the [t2-skins](https://github.com/exogen/t2-skins)
+repository, which is the source for all the custom skins that will be listed in
+the dropdown menu. Adding a new skin to that repository will make it
+automatically appear in the menu during build time.
+
+If [t2-skins](https://github.com/exogen/t2-skins) is not a sibling folder to
+`t2-model-skinner`, set the `T2_SKINS_PATH` environment variable to its path.