Barebones Section 3 writings.
Merge branch 'markdown' into i6-write-section-3
Describe the repository home page.
Add another screenshot for GitHub Notifier.
Oops, wrong folder.
Put proper image links in.
Oops, image syntax.  (Again.)
More syntax tweaks?
Use raw URLs for the images.
Improve the linking to GitHub Notifier.
Merge pull request #6 from rogerhutchings/i6-write-section-3

Write Section 3 - Interface overview