initial commit

README.md

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 # predeval
 A JavaScript module for interactive exploration of forecast evaluations
+
+# Development
+
+## Node
+
+You'll need to install Node.js and npm.  Please see the installation instructions at https://docs.npmjs.com/downloading-and-installing-node-js-and-npm.
+
+## Installing dev requirements
+
+You must install the required Node.js packages via:
+
+```bash
+npm install --save-dev
+```
+
+## Packaging the component
+
+We use [webpack](https://webpack.js.org/) to package up all dependencies into a single `dist/predeval.bundle.js` file for end users. To do so, execute the `package.json` `build` script via the following command, which will update all files in `dist/`.
+
+```bash
+npm run build
+```