Add docs README (#328)

docs/README.md

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+# React Server docs
+
+Welcome to the React Server docs!  React Server assumes a separate back end
+server to serve a JSON api that it can call to get its data, and is a
+bring-your-own Flux implementation stack.  At Redfin, we use
+[Spring MVC](http://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html)
+and [Reflux](https://github.com/reflux/refluxjs), respectively, but it shouldn't
+matter what technology you chose for either.  Choosing a tech stack is out of
+scope for our documentation, but come swing by our gitter if you'd like to talk
+about it.
+
+If you still aren't convinced on React Server, check out our
+[Why React Server](/why-react-server.md) doc, which explains why you might want
+to use React Server, and the [Design Doc](/design.md), which explains why we
+built React Server and some of the decisions we made along the way.
+
+To get started working with a new React Server project, you'll probably want to
+check out the [Writing pages guide](/writing-pages.md) first, which details how
+to create a new web page in a React Server app.  You'll also want to check out
+the [Page API](/page-api.md), and you may want to also check out
+[Writing Middleware](/writing-middleware.md), which explains how to write code
+that runs for every route.
+
+To dig deeper into understanding React Server, you may want to learn about
+[how logging works](/logging.md), [client transitions](/client-transitions.md),
+and [understanding rendering](/understanding-rendering.md).