$jdb = new Jsondb($path);
$jdb->create($table, $keys);
$keys = Array(
'id'=>Array('auto_increment'),
'title'=>Array('default'=>'habrahabr'),
'posts',
'userId'
);
$jdb->create('habr', $keys);
"posts": [
{ "id": 1, "title": "json-server", "author": "typicode" }
],
"comments": [
{ "id": 1, "body": "some comment", "postId": 1 }
],
"profile": { "name": "typicode" }
}