Merge branch 'guidelines' into 'master'

Added image guidelines to the README

Fixes #252

See merge request !568

README.md

@@ -78,6 +78,12 @@ Add the following to the top of a blog post (between the --- markers) and it wil
     image_title: '/images/unspash/hardware.jpg'
+# Image Guidelines
+When adding images to the site, please avoid using largely sized images, as they drastically decrease load on the server and make the experience poor for the user. 
+Also make sure to compress the images as much as possible (use online resource, Photoshop, however you'd like)
+
+You can find images at unsplash.com and then compress them at tinypng.com.
+
 You can link to the authors twitter account with:
     author_twitter: sytses