addded directory "bin" in root folder, implemented command line php scri...

Hey guys,

first scribbled implementation (but working and safe) for easy up dealing with users.
I would like to do the same for channels and refactor the created code to an elegant way.
Any important remarks?

Thanks so far for the great project.

# commit message
    added directory "bin" in root folder, implemented command line php scripts to add, delete and list users. Added *.example files and copy them if real files does not exist.

# usage

```php
php bin/users.php
```