create function to upload a whole folder structure

Create a function in `main.py` to create the folder structure of the given directory and upload all files in it.

There must also be some code implemented in the `backups/googledrive.py`

so that `python3 main.py --upload /Users/foo/Documents/Skydive -google -dir` will create the following sturcture of the tree on the remote and upload all files in the directories to the storage.

example

```
.
├── testmore
│   ├── xz
│   └── zy
│   ├── ab
│   ├── bc
│   └── fg
└── whynot
```