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/howtos/code/store/en.md

@@ -0,0 +1,33 @@
+---
+title: Sharing data between parts
+for: developers
+about: Shows how you use the pattern store to share data between parts
+---
+
+Sometimes, you'll want to access data from one part into another part.
+For example, you may store the length of the armhole in your front and back parts,
+and then read that value when drafting the sleeve so you can verify the sleeve fits the armhole.
+
+For this, you should use the [Store](/reference/api/store/), which is available via 
+the [shorthand](/howtos/core/shorthand/) call:
+
+```js
+export default function(part) {
+  let { store } = part.shorthand();
+  store.set('hello', 'world');
+
+  return part();
+}
+```
+
+```js
+export default function(part) {
+  let { store } = part.shorthand();
+  store.get('hello'); // Returns 'world'
+
+  return part();
+}
+```
+
+In a case like this, the order in which parts are drafted becomes important, so you
+should reflect that in the [pattern configuration](/reference/config/).