Add easter egg command

[Polpetta]

Note: I don't know how to hide it from Clikt, I'd merge after we find a way

I generated the ASCII arts with the following Javascript snippet:

var figlet = require('figlet');
var fs = require('fs');
var prints = [];
figlet.fontsSync().forEach(item => {
    prints.push(figlet.textSync('JKK', {
        font: item,
        horizontalLayout: 'default',
        verticalLayout: 'default'
    }));
});

fs.writeFileSync('logos.json', JSON.stringify(prints));
console.log('done')

See https://github.com/patorjk/figlet.js

[Polpetta]

Note to myself: searching in the Clikt documentation it seems to be something we want: https://ajalt.github.io/clikt/api/clikt/com.github.ajalt.clikt.parameters.options/-option/hidden/