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/api/store/en.md

@@ -0,0 +1,29 @@
+---
+title: "Store"
+components: true
+order: 70
+---
+
+The **Store** object holds a simple key/value store with 
+methods for storing and retrieving information.  
+A single store per pattern is shared by all pattern parts.
+
+A store is typically used to share information between parts. For example
+the length of the neck opening in one part can be used to calculate the 
+length for the collar in another part.
+
+The `Store` object exposes the following methods:
+
+<ReadMore list />
+
+<Tip>
+
+###### The store is available as shorthand
+
+You can access the store instance from the [Part.shorthand](/reference/api/part/shorthand/) method;
+
+```js
+let { store } = part.shorthand();
+```
+
+</Tip>