Merge pull request #40 from sjrd/add-javadoc-link

Add usage instructions and link to Scaladoc.

Author: sjrd

README.md

@@ -7,3 +7,19 @@ running [Node.js](https://nodejs.org/) with
 This repository contains `scalajs-env-jsdom-nodejs` for Scala.js 1.x. In
 Scala.js 0.6.x, the Node.js with jsdom environment is part of the core
 distribution.
+
+## Usage
+
+Add the following line to `project/plugins.sbt`:
+
+```scala
+libraryDependencies += "org.scala-js" %% "scalajs-env-jsdom-nodejs" % "1.0.0"
+```
+
+and the following line to `build.sbt` (possibly in the `settings`/`jsSettings` of Scala.js projects):
+
+```scala
+jsEnv := new org.scalajs.jsenv.jsdomnodejs.JSDOMNodeJSEnv()
+```
+
+See [the Scaladoc](https://javadoc.io/doc/org.scala-js/scalajs-env-jsdom-nodejs_2.13/latest/org/scalajs/jsenv/jsdomnodejs/index.html) for other configuration options.