add font usage info

fonts/display.php

@@ -30,6 +30,13 @@ $fontname = $matches[1];
             <p></p>
 
             <p>here's a sample of the font</p>
+
+            <p>you can use this font by importing it or linking it as a stylesheet:</p>
+            <pre>@import https://tilde.team/~ben/fonts/<?=$font?>/font.css;</pre>
+            <pre>&lt;link rel="stylesheet" href="https://tilde.team/~ben/fonts/<?=$font?>/font.css"&gt;</pre>
+
+            <p>and then using the font name in a font-face css rule:</p>
+            <pre>* { font-family: '<?=$fontname?>'; }</pre>
             
             <hr>