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/reference/settings/locale/en.md

@@ -0,0 +1,16 @@
+--- 
+title: locale
+---
+
+A 2-letter language code that indicates what language the user wants.
+
+This will be used to set the `xml:lang` attribute in the `svg` tag when rendering to SVG,
+and by [the i18n plugin](/reference/plugins/i18n/) to translate the pattern.
+
+```js
+import brian from "@freesewing/brian";
+
+let pattern = new brian({
+  locale: "es"
+})
+```