[NODE] Add Bool variable documentation

[ShambaC]

Node Config

{
    title: "Boolean Input",
    category: "input",
    type: "bool_var",
    icon: {},
    desc: "Boolean variable",
    credit: 100,
    inputs: [],
    outputs: [
        {
            name: "Boolean",
            type: "Boolean",
            desc: "",
        }
    ],
    fields: [
        {
            name: "Boolean",
            type: "CheckBox",
            desc: "",
            value: true,
        },
    ],
    difficulty: "easy",
    tags: ['bool', 'true', 'false'],
}

Additional Information

Long Description:
A True/False binary value node meant for logical operations

Use Cases:

• Manage checkbox values
• Parse yes/no replies from users

[github-actions]

✅ Documentation processed successfully!

A pull request has been created: #40

The node documentation will be reviewed and merged if everything looks correct.