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/editors/howtos/blogpost/add-images/en.md

@@ -0,0 +1,23 @@
+---
+title: Add images to the folder
+order: 30
+---
+
+Add the images you want to use to the folder. Keep the following guidelines in mind:
+
+ - The main blog picture should be a landscape image
+ - The best resolution for the main image is 2000x1348 pixels
+ - None of the images should be larger than 2000px on their longest side
+ - Use lowercase for all filenames
+
+<Note>
+
+##### Please think twice before dropping a 7Mb image.
+
+Git never forgets. So if you drop a couple of 7Mb images into our repo,
+they will be there forever, making cloning the repo very slow.
+
+So please resize your images before you commit your changes.
+
+</Note>
+