README.md: Add install instructions for Codio
README.md: Add images for the Codio walkthrough.
README.md: Add newlines before the image.
README.md: Remove "for now"
README.md: Remove Mac OS X from the platforms with reported issues.
README.md: Bold some text to highlight
Merge pull request #75 from duckduckgo/jag/codio

Add Codio Walkthrough