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/org/docs/guide/options/units/en.md

@@ -0,0 +1,14 @@
+---
+title: Units
+---
+
+This controls the units used (by the text) on the pattern. 
+
+Freesewing supports two types of units:
+
+ - Metric units (cm)
+ - Imperial units (inch)
+ 
+You can configure your default units in your account settings.  
+In addition, you can set the units individually for each model.  
+And if that wasn't enough, you can still override the units for an individual pattern with this setting.