Update documentation

README.md

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 # Art Museum
 
-A website for displaying personal pictures and videos. Manage using [Curator](https://gitlab.com/Zander671/curator).
+Art Museum is a website for displaying personal pictures and videos. An example
+instance can be found [here](https:// pics.zander.im).
+
+![Screenshot of the Art Museum home page](screenshot.png)
+
+[1]: https://gitlab.com/Zander671/curator
+
+In the interest of ensuring compatibility with even the most bare-bones web
+hosts, image processing and management happens on your local machine using
+[Curator][1]. Because of this, the only requirement on the server-side is PHP
+with JSON support.
+
+Art Museum can display a variety of image formats, audio files, and video
+files. It also supports displaying date, time, and location metadata for all of
+these files. This metadata is calculated during upload and stored separate from
+the media file itself, therefore, metadata can be shown for every uploaded file
+even if the underlying format does not support it.
+
+### Installation
+
+To install, clone this repository and point your web server at the `root`
+directory. Then, change the `root` key in the `root/options.php` file to point
+to your data directory. This data directory needs to be readable by the user
+that will execute the PHP scripts. It should be the directory that you uploaded
+your data to with [Curator][1].
+
+The example instance given above runs on nginx with PHP 8.3. However, as it uses
+fairly basic PHP, it should work on any reasonably recent version.