Use this skill when you need to draw diagrams including: Flowchart, Sequence Diagram, Class Diagram, State Diagram, ER Diagram, User Journey, Gantt Chart, Pie Chart, Quadrant Chart, Requirement Diagram, Gitgraph, Mindmap, Timeline, Sankey, XY Chart (Bar/Line), Block Diagram, Packet Diagram, Kanban, Architecture Diagram, C4 Diagram, Radar Chart, Treemap, and ZenUML. You MUST use this skill BEFORE outputting any mermaid code block.