Implement web interface

[tadatuta]

Interface to generate such structure needed:

{
    "https://github.com/tadatuta/tst": {
        "master": {
            "README.md": {
                "sourceLang": "en",
                "targets": [
                    {
                        "file": "README.ru.md",
                        "lang": "ru"
                    },
                    {
                        "file": "README.uk.md",
                        "lang": "uk"
                    }
                ]
            }
        }
    }
}