Syntax highlighting for Mermaid diagrams.

• Flowcharts
• Sequence diagrams
• Class diagrams
• State diagrams
• ER diagrams
• User journeys
• Gantt charts
• Pie charts
• Quadrant charts
• Requirement diagrams
• Git graphs
• C4 diagrams
• Mindmaps
• Timelines
• ZenUML sequence diagrams
• Sankey graphs
• XY charts
• Block diagrams
• Packet diagrams
• Kanban diagrams
• Architecture diagrams
• Radar diagrams
• Treemaps

You'll need Git, because this won't ever appear in Atom's package registry:

# On Unix-like platforms
cd ~/.atom/packages && git clone https://github.com/Alhadis/language-mermaid.git

:: For Windows users
cd %HOMEPATH%\.atom\packages
git clone "https://github.com/Alhadis/language-mermaid.git"