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/tutorials/pattern-design/creating-the-closure/en.md

@@ -0,0 +1,67 @@
+---
+title: Creating the closure
+order: 210
+---
+
+Things are starting to look good, but we can't fit the bib over the baby's head like this.
+So we must create a closure. We'll let the straps overlap at the end, and put in a snap.
+
+To round the straps, we'll use something new: **a macro**.
+
+Macros are little helpers that automate things that would otherwise get rather tedious.
+There are macros to add titles to your pattern, or grainline indicators, a scalebox, and
+there's a macro to round corners. The `round` macro.
+
+Before we can use it, we have to update our `part.shorthand()` call to indicate that we'd
+also like to make use of macros. Simply add `macro` at the end:
+
+```js
+let {
+  Point,
+  points,
+  Path,
+  paths,
+  measurements,
+  options,
+  macro
+} = part.shorthand();
+```
+
+We need a half circle here, but the `round` macro works on 90° angles, so you'll use it twice.
+
+As such, let's add some points to guide the macro, and then put it to work:
+
+```js
+let strap = points.edgeTop.dy(points.top);
+
+points.tipRight = points.edgeTop.translate(strap / 2, strap / 2);
+points.tipRightTop = new Point(points.tipRight.x, points.edgeTop.y);
+points.tipRightBottom = new Point(points.tipRight.x, points.top.y);
+
+macro("round", {
+  from: points.edgeTop,
+  to: points.tipRight,
+  via: points.tipRightTop,
+  prefix: "tipRightTop",
+  render: true
+});
+macro("round", {
+  from: points.tipRight,
+  to: points.top,
+  via: points.tipRightBottom,
+  prefix: "tipRightBottom",
+  render: true
+});
+```
+
+<Fixme> Add link to macro/extend docs </Fixme>
+
+<Example pattern="tutorial" part="step7" caption="Pretty good, but how are we going to fit it over the baby's head?" />
+
+Like our neck opening, we've only drawn half since we can simply copy the points to the other side.
+
+However, doing so would make both straps overlap. Which doesn't work for a pattern as it would make it
+impossible to cut it out of a single piece of fabric. So let's deal with the overlap next.
+
+
+