Update readme

Author: pomber

readme.md

@@ -5,12 +5,14 @@ The syntax highlighter used by Code Hike.
 ```js
 import { highlight } from "@code-hike/lighter";
 
-const { lines, colors } = await highlight(
+const { lines, style } = await highlight(
   /* code  */ "print('hello')",
   /* lang  */ "py",
   /* theme */ "github-dark"
 );
-const { foreground, background } = colors;
+
+// base foreground and background
+const { color, background } = style;
 
 console.log(lines);
 ```
@@ -28,6 +30,16 @@ Output:
 ]
 ```
 
+For **dark/light theme support with CSS** see [#25](https://github.com/code-hike/lighter/pull/25)
+
+For more theme colors (like line number foreground, selection background, etc.):
+
+```js
+import { getThemeColors } from "@code-hike/lighter";
+
+const themeColors = await getThemeColors("material-darker");
+```
+
 ## Credits
 
 - Using [vscode-oniguruma](https://github.com/microsoft/vscode-oniguruma) for highlighting

test/index.js

@@ -0,0 +1,13 @@
+import { highlight } from "@code-hike/lighter";
+
+const { lines, style } = await highlight(
+  /* code  */ "print('hello')",
+  /* lang  */ "py",
+  /* theme */ "github-dark"
+);
+
+// base foreground and background
+const { color, background } = style;
+
+console.log(color, background);
+console.log(lines);