Add instructions for theme-only import to README

README.md

@@ -7,18 +7,19 @@ A simple theme implementation for [Material UI](https://material-ui.com/) which
 Install the package with e.g.
 
 ```bash
-yarn add react @material-ui/core git+https://git.gsc.org.uk/utils/gsc-material.git
+yarn add react @material-ui/core git+https://gitlab.gsc.org.uk/gsc-frameworks/gsc-material.git
 ```
 
 Note that this depends on the `gsc-material` package being stored in a public Git repository.
 
 Then simply wrap your app's main component with the `<GSCMaterial>` component. For example, in the `index.js` file generated by `create-react-app`, use something like:
 
-```js
+```jsx
 import React from "react";
 import ReactDOM from "react-dom";
 import GSCMaterial from "@gsc/material";
 import "@gsc/material/ProximaNovaFontFace.css";
+import "@gsc/material/ArialFontFace.css"; // if required
 import App from "./App";
 
 ReactDOM.render(
@@ -29,6 +30,37 @@ ReactDOM.render(
 );
 ```
 
+### Theme Only
+
+If you don't intend to use any of Material-UI's components and just want to use the styling solution (`@material-ui/styles`), you can do the following instead.
+
+Install the package with e.g.
+
+```bash
+yarn add react @material-ui/styles git+https://gitlab.gsc.org.uk/gsc-frameworks/gsc-material.git
+```
+
+Then wrap your app's main component with the `<MuiThemeProvider>` component and supply the exported theme:
+
+```jsx
+import React from "react";
+import ReactDOM from "react-dom";
+import { MuiThemeProvider } from "@material-ui/styles";
+import GSCTheme from "@gsc/material/theme";
+import "@gsc/material/ProximaNovaFontFace.css";
+import "@gsc/material/ArialFontFace.css"; // if required
+import App from "./App";
+
+ReactDOM.render(
+    <MuiThemeProvider theme={GSCTheme}>
+        <App />
+    </MuiThemeProvider>,
+    document.getElementById("root")
+);
+```
+
+This is essentially what the 'full' version of the package does behind the scenes, but it also implements Material-UI's `CssBaseline` component. If you are only using the theme as shown here, you may have to perform your own CSS reset or normalization.
+
 ## Adding Fonts
 
 In a JavaScript app:
@@ -40,11 +72,13 @@ import "@gsc/material/ProximaNovaFontFace.css";
 or, in plain HTML:
 
 ```html
-<link rel="stylesheet" type="text/css" href="ProximaNovaFontFace.css">
+<link rel="stylesheet" type="text/css" href="ProximaNovaFontFace.css" />
 ```
 
 Note that the font files themselves are not supposed to be distributed with the package. The design of this package is such that they will be obtained directly from `style.gsc.org.uk`.
 
+A `font-face` declaration for Arial (`ArialFontFace.css`) is also included. This is usually unnecessary as it is a web-safe system font, but is sometimes required when designing for specific devices e.g. digital signage.
+
 ## Images
 
 GSC logos are stored in the `img` directory for posterity. These are also not distributed with the package.