wellflat

This is a plugin which gives you a small card to show your GitHub user profile summary. You just have to put shortcode.
Features include: 
+ GitHub account name and avatar 
+ recently active repository 
+ frequently used language list sorted by repository’s stargazers count 
+ public repositories and gists count 
+ followers count 
+ total stargazers count
Notice: 
This plugin caches GitHub user profile data into the database (expires 4 hours).

WP GitHub Card

This plugin provides simple GitHub profile summary card.

Jason Stallings

ianmjones

olensmar

nlenkowski

Github README is a plugin that allows you to embed markdown from GitHub in a page or post using a simple shortcode.
Usage:
github_readme
This shortcode embeds the project’s readme.
[github_readme repo=”octalmage/Marknote”]
You can also trim lines from the top of the readme using the “trim” option:
[github_readme repo=”octalmage/Marknote” trim=”3″]
This is useful for removing titles since your page/post will most likely already have one.
github_markdown
This shortcode embeds any markdown file found in the repository.
[github_markdown repo=”octalmage/Marknote” file=”README.md”]
trim, branch, and cache (seconds to cache) also supported.
github_wikipage
This shortcode embeds pages from a project’s wiki.
[github_wikipage repo=”octalmage/Marknote” page=”Syntax”]
trim and cache also supported.

Github README

As described... it work fine and very well!

One suggestion: from the guide https://guides.github.com/features/mastering-markdown/ the relative images are resolved with absolute path on the github repository.

Very Good!

Easily embed GitHub READMEs in pages/posts.

WP GitHub Card vs Github README