feat: add pre-built CSS for CDN usage (#27)

* feat: add server-mono.css for CDN

* feat: update README.md to include pre-built CSS

Author: caidanw

README.md

@@ -52,9 +52,16 @@ Copy the below snippet into your CSS file:
 
 ### CDN Hosted
 
-ServerMono is also available through the [jsDelivr CDN](https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/), so that you can use the fonts with downloading and hosting them yourself.
+Server Mono is also available through the [jsDelivr CDN](https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/), so that you can use the fonts without downloading and hosting them yourself.
 
-Copy the below snippet into your CSS file:
+Use the pre-built CSS to quickly add Server Mono on your website:
+
+```html
+<link rel="preconnect" href="https://cdn.jsdelivr.net">
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/server-mono.css">
+```
+
+Or you can copy the below snippet into your CSS file:
 
 ```css
 /* Regular weight - used for normal text */

server-mono.css

@@ -0,0 +1,21 @@
+/* Regular weight - used for normal text */
+@font-face {
+  font-family: 'ServerMono';
+  src: url('https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/ServerMono-Regular.woff2') format('woff2'),    /* Best compression, modern browsers */
+       url('https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/ServerMono-Regular.woff') format('woff'),      /* Good compression, wider support */
+       url('https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/ServerMono-Regular.otf') format('opentype');   /* Largest files, universal support */
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+
+/* Slanted variant - used for italic/oblique text */
+@font-face {
+  font-family: 'ServerMono';
+  src: url('https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/ServerMono-RegularSlanted.woff2') format('woff2'),
+       url('https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/ServerMono-RegularSlanted.woff') format('woff'),
+       url('https://cdn.jsdelivr.net/gh/internet-development/www-server-mono/public/fonts/ServerMono-RegularSlanted.otf') format('opentype');
+  font-weight: normal;
+  font-style: oblique;
+  font-display: swap;
+}