Improve documentation.

README.md

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 # Is de FooBar open?
 
 Source code for the unofficial FooBar website.
+
+## Building
+
+This project requires both `composer` and `yarn` (`npm` might work as a
+replacement) to build. 
+
+```bash
+composer update --no-dev
+yarn
+yarn run webpack --mode production
+```
+
+This will download all dependencies and compile javascript as needed.
+
+## Installation
+
+After building, you can install the project on your web server by copying
+everything (except for the `node_modules`) to your server. The document root
+should be `public`.
+
+## Configuration
+
+The website will attempt to load configuration from `config/config.php` and
+if that doesn't work, from `config/config.sample.php`. You can create your own
+configuration by copying the sample and changing parameters as needed.
+
+The sample configuration also contains details on the particular options.