From the readme …
Add an image to a markdown document with automatic free image hosting.
auto-host-markdown-image (ahmi) is an Atom editor package that allows easy insertion of image files into markdown documents. Insertion of the image is a simple drag/drop operation. The file is pushed to the free Imgur hosting service. Then the Imgur URL for the image is formatted and inserted into the markdown text. The image shows in the Atom markdown preview immediately.
Install ahmi with the command
apm install auto-host-markdown-image or by using the settings page.
Open an image file in an Atom tab.
Select a markdown file with the cursor where the image should go.
Drag the tab above the image file into the markdown text. The image will be inserted at the cursor.
There is no charge for hosting. The free anonymous open-source Imgur account allows approximately 1,250 uploads per day or approximately 12,500 requests per day. If this package ever generates that much traffic (not bloody likely) we’ll worry about limiting it.
Auto-host-markdown-image is copyright Mark Hahn with an MIT license.