Karlsruher Verkehrsverbund README badges

Pick a style, then open it in the editor to tweak and copy.

• flatplusOpen in editor
• gradientOpen in editor
• outlineOpen in editor
• pillOpen in editor
• glossyOpen in editor
• neonOpen in editor
• retroOpen in editor
• minimalOpen in editor
• ribbonOpen in editor
• terminalOpen in editor