How to add a custom command?

I'd like to create a custom command, and maybe make a plugin out of it for those who might need it.

I don't see any documentation on how to do it, and current plugins don't add commands.

Current plugin looks like this

```js
module.exports = {

loadPlugin: function() {

module.exports = Object.assign(module.exports, {

'init:api:addfunction:hook': function() {

console.log('custom command')

return {};
}
});

delete module.exports.loadPlugin;
},
name: 'fresh',
hooks: [
'init:api:addfunction:hook'
]
};
```

It's loaded successfully as a plugin but I can't find out how to add it to the bin file & add it as an actual command

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