Composer external package manual

composer.json

{  
  "repositories": [
        {
            "type": "package",
            "package": {
                "version": "2.0",
                "type": "neos-plugin",
                "name": "networkteam/neos-mailobfuscator",
                "source": {
                    "url": "https://github.com/ComiR/Networkteam.Neos.MailObfuscator.git",
                    "type": "git",
                    "reference": "2.0"
                },
                "autoload": {
                    "psr-4": {
                        "Networkteam\\Neos\\MailObfuscator\\": "Classes"
                    }
                }
            }
        }
  ]
}