Update 'readme.md'

readme.md

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 # jekyll-theme-basic
 
-An incredibly rudimentary jekyll theme. Paper-thin, nothing but what's needed.
+An incredibly rudimentary jekyll theme. Paper-thin, nothing but what's needed for HTML.
+
+You can see it up and running on my [blog](https://atlas48.sdf.org/) and my [website](https://atlas48.neocities.org), which this theme was originally made for.
+
+## Config
+
+This theme has a few options that one may use. Every option is under the `basic_theme` hierachy.
+
+### `header_links`
+
+`Array<Object<string>[2]>`
+
+An array of objects with two keys, `href` & `name`. Each sub-object describes a certain link element you want
+on the top of the page.
+
+**Example:**
+```yaml
+basic:
+  header_links:
+    - href: https://github.com/Atlas48
+      name: GitHub
+    - href: https://atlas48.neocities.org/
+      name: The Archives
+    - href: https://mastodon.sdf.org/@atlas48
+      name: Mastodon
+```
+
+### `display_title`
+
+`bool`
+
+Wherever or not to display the site's title at the top of the page.