feat: Flat import of markdown repo

This is a flat (without history) import of (some of) the content
from our markdown module.

We've imported this without history because the repo contains our
blog posts and showcases posts content prior to porting them to strapi.

Since this contains many images, it would balloon the size of this repo
to import the full history.

Instead, please refer to the history of the (archived) markdown repo
at: https://github.com/freesewing/markdown

markdown/dev/guides/plugins/using-hooks-without-plugin/en.md

@@ -0,0 +1,20 @@
+---
+title: Using hooks without a plugin
+order: 85
+---
+
+You can attach a method to a hook at run-time without the need for a plugin 
+using the [Pattern.on()](/reference/api/pattern/on) method.
+
+The method takes the hook name as its first argument, and the hook method as its second.
+
+Below is an example:
+
+```js
+pattern.on('preRender', function(svg) {
+  svg.style += "svg { background: yellow;}";
+});
+```
+
+Congratulations, you've just made your pattern yellow.
+