Update README with parameter information

README.md

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 # sakura-hugo-theme
-A minimal blog theme for Hugo using [Sakura](https://github.com/oxalorg/sakura).
+
+A minimal blog theme for Hugo using [Sakura](https://github.com/oxalorg/sakura) that uses no custom CSS.
+
+For an example of this theme in action, check out [my blog](https://blog.elnu.com/) ([repository](https://github.com/ElnuDev/blog.elnu.com))!
+
+## Parameters
+
+This theme supports some basic configuration options in addition to support for [Matomo analytics](https://matomo.org/) a FOSS and self-hosted analytics solution.
+
+- `Theme`: Variant of Sakura to use. If unspecified, will default to `sakura.css`. e.g `Theme = 'dark'` will use `sakura-dark.css`. Available variant themes:
+  - `dark-solarized`
+  - `dark`
+  - `earthly`
+  - `ink`
+  - `pink`
+  - `vader`
+- `HomepageHeader`: Text displayed at the absolute top of the homepage, hidden on pagination. Can include HTML markup.
+- `MatomoURL`: URL of Matomo analytics server.
+- `MatomoSiteId`: Site ID of Matomo. **Must be string.**