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/guides/patterns/store/en.md

@@ -0,0 +1,16 @@
+---
+title: Store
+order: 70
+---
+
+<Example 
+  part="docs_overview" 
+  caption="The store provides pattern-wide key/value storage"
+  options={{focus: "Store"}}
+/>
+
+The store provides key-value storage that is shared across your pattern.
+
+If you have some information in one part that you want to make available
+outside that part (in another part) you can save it to the store.
+