v0.7.0: Support Architecture Diagrams

What's new

The mermaid provides a feature to visualize infrastructure architecture as a beta version, and that feature has been supported.

Syntax is here.

The output image is shown below.

## Architecture Diagram
```mermaid
architecture-beta
    service left_disk(disk)[Disk]
    service top_disk(disk)[Disk]
    service bottom_disk(disk)[Disk]
    service top_gateway(internet)[Gateway]
    service bottom_gateway(internet)[Gateway]
    junction junctionCenter
    junction junctionRight

    left_disk:R -- L:junctionCenter
    top_disk:B -- T:junctionCenter
    bottom_disk:T -- B:junctionCenter
    junctionCenter:R -- L:junctionRight
    top_gateway:B -- T:junctionRight
    bottom_gateway:T -- B:junctionRight
```

What's Changed

• Add Architecture Diagrams by @nao1215 in #34
• Add example code by @nao1215 in #35

Full Changelog: v0.6.0...v0.7.0