Run folderizer to move files into folders based on their file extension

I want to run folderizer to organize files based on their file extension.

Users should be able to run folderizer like below:

```
folderizer desktop --detailed
```

The tentative "detailed" routine will move files into folders according to their extension, e.g:
`.jpeg`: `jpeg files`
`.doc`:`doc files`
`.mp3`: `mp3 files`
...etc