Emojis can be added to Pull Requests, Issues, commit messages, Markdown files, etc. using :name_of_emoji:
:
:smile:
Would produce:
:smile:
The full list of supported Emojis on GitHub can be found at emoji-cheat-sheet.com or scotch-io/All-Github-Emoji-Icons.
The top 5 used Ejmojis on GitHub are:
:shipit:
:sparkles:
:-1:
:+1:
:clap:
Images and GIFs can be added to comments, READMEs etc.:
![Alt Text](http://www.sheawong.com/wp-content/uploads/2013/08/keephatin.gif)
Raw images from the repo can be used by calling them directly.:
![Alt Text](https://github.com/(user)/(repo)/raw/master/path/to/image.gif)
All images are cached on GitHub, so if your host goes down, the image will remain available.