Feat Mermaid Markdown [Masks] (#60)

[+] feat(masks/en.ts): add support for Mermaid Diagram Flowchart Creation mask
[+] feat(masks/en.ts): add support for Mermaid Sequence Diagram Creation mask
[+] feat(masks/en.ts): add support for Mermaid Class diagrams Creation mask
[+] feat(masks/en.ts): add support for Mermaid State Diagram Creation mask
[+] feat(masks/en.ts): add support for Mermaid Entity Relationship Diagram Creation mask
[+] feat(masks/en.ts): add support for Mermaid User Journey Diagram Creation mask
[+] feat(masks/en.ts): add support for Mermaid Gantt diagrams Creation mask
[+] feat(masks/en.ts): add support for Mermaid Quadrant Chart diagram Creation mask
[+] feat(masks/en.ts): add support for Mermaid Requirement Diagram Creation mask