Add READMEs

Author: mjackson

README.md

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+This repository contains demos of using [unpkg.com](https://unpkg.com) to load and run various libraries in different ways. Each demo contains a README that explains a little bit more about how to use it and why it's interesting.
+
+The following demos are currently available:
+
+- [basic-react](basic-react) - Loads React as a global with JSX support
+- [systemjs-react-bundle](systemjs-react-bundle) - Uses SystemJS to load React as a global, with JSX support
+- [systemjs-react](systemjs-react) - Uses SystemJS to load React as modules, with JSX support
+- [systemjs-angular](systemjs-angular) - Uses SystemJS to load Angular as modules, with TypeScript support
+- [getlibs-react](getlibs-react) - Uses [getlibs](https://github.com/activewidgets/getlibs) as a convenience layer to easily load React as a global, with support for JSX
+- [webpack-react](webpack-react) - Uses webpack to automatically detect and load React as a global, with JSX compilation at build time
+
+If you're using a technique you don't see listed here, please contribute! There are lots of different ways to use unpkg, and we're just scratching the surface.

basic-react/README.md

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+This demo loads the global build of [React](https://facebook.github.io/react/) and [babel-standalone](https://github.com/babel/babel-standalone) from unpkg to get a development environment up and running quickly. Script compilation, including JSX, is done on the fly in the browser when scripts are contained in `<script type="text/babel">`.
+
+To run it:
+
+```
+$ npm install -g serve
+$ serve .
+```

getlibs-react/README.md

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+This demo uses the [getlibs](https://github.com/activewidgets/getlibs) script to automatically load React as a global via [SystemJS](https://github.com/systemjs/systemjs). getlibs is interesting because it doesn't require any extra configuration; just a single `<script>` tag!
+
+To run it:
+
+```
+$ npm install -g serve
+$ serve .
+```

systemjs-angular/README.md

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+This demo loads [Angular](https://angularjs.org/) as modules via [SystemJS](https://github.com/systemjs/systemjs). Script compilation (TypeScript) is done on the fly in the browser when scripts are loaded using `System.import`.
+
+To run it:
+
+```
+$ npm install -g serve
+$ serve .
+```

systemjs-react-bundle/README.md

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+This demo loads the global build of [React](https://facebook.github.io/react/) and [babel-standalone](https://github.com/babel/babel-standalone) from unpkg via [SystemJS](https://github.com/systemjs/systemjs) to get a development environment up and running quickly. Script compilation, including JSX, is done on the fly in the browser when scripts are loaded using `System.import`.
+
+To run it:
+
+```
+$ npm install -g serve
+$ serve .
+```

systemjs-react/README.md

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+This demo loads [React](https://facebook.github.io/react/) as modules via [SystemJS](https://github.com/systemjs/systemjs). Script compilation, including JSX, is done on the fly in the browser when scripts are loaded using `System.import`.
+
+To run it:
+
+```
+$ npm install -g serve
+$ serve .
+```

webpack-react/README.md

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+This demo uses [webpack](https://webpack.github.io/) with the [modules-cdn-webpack-plugin](https://www.npmjs.com/package/modules-cdn-webpack-plugin) to load dependencies from unpkg.
+
+The `modules-cdn-webpack-plugin` automatically detects dependencies and pulls their version numbers from the ones you've installed locally in `node_modules`. Then, it inserts the appropriate `<script>` tags in the output.
+
+To run it:
+
+```
+$ npm install
+$ npm start
+```