Create prefetch.md

Author: mhughes2k

docs/guides/javascript/modules/prefetch.md

@@ -0,0 +1,26 @@
+---
+title: Prefetch
+---
+<Since versions={[ 3.9 ]} />
+
+Assets including strings, and templates, can be pre-fetched shortly after the page loads to improve the perceived performance of the page when consuming those components.
+
+```todo
+Link to jsdocs here
+```
+
+```js title="Example of fetching a string and template"
+import Prefetch from 'core/prefetch';
+
+// Prefetch the string 'discussion' from the 'mod_forum' component.
+Prefetch.prefetchString('discussion', 'mod_forum');
+
+// Prefetch the strings yes, no, and maybe from the 'core' component.
+Prefetch.prefetchStrings('core', ['yes', 'no', 'maybe']);
+
+// Prefetch the templates 'core/toast'.
+Prefetch.prefetchTemplate('core/toast');
+
+// Prefetch the templates 'core/toast' and 'core/modal'.
+Prefetch.prefetchTemplates(['core/toast', 'core/modal']);
+```