Preparation:
Start with clean, fresh and updated Raspbian SD Image
https://www.raspberrypi.org/downloads/raspbian/

In Desktop Environment:

Connect to Wlan in upper right corner
Startx: Menu ->Preferences -> Raspberry Pi Configuration -> System -> Boot: To CLI
Startx: Menu ->Preferences -> Raspberry Pi Configuration -> System -> Network at boot: Wait for network checked
Startx: Menu ->Preferences -> Raspberry Pi Configuration -> Performance -> GPU Memory: 128
Then reboot

Disconnect any USB-Drives bevor executing the setup command
Type commands to CLI:

sudo git clone https://github.com/bb12489/Slideshow.git /home/pi/temp

cd temp

sudo python setup.py

Wait for reboot then connect USB-Stick

Featuers:
Preconfigured samba share, to access all needed folders and settings
New pictures shown first, then randomly
Display advertisment after x pictures
Slideshow runs of USB Stick for easy deleting of files and to keep things tidy
Local webserver to change settings of the slideshow. Connect to the Wlan, which the pi is connected to
and type http://raspberrypi to access the settings page

Useful knowledge:

If you need a sync tool to sync files from windows to the slideshow, there is a minimalistic windows application insides the application samba share folder. With this application you can specify a windows folder as source and the slideshow_hotfolder as destination.

To update remove the following folder from this installation and start over.

sudo rm -rf /home/pi/temp

To prevent autostart add a reset.txt file to the USB-Stick and boot.
To quit running slideshow simply type to your Raspberry:

sudo killall python

Samba share structure:
Advertising: Folder for Ads
Application: The scripts and setting.ini file
Slideshow_Hotfolder: Here you put new files in
Slideshow_Content: The content of the slideshow (USB-Stick)

Behaviour:
The Slideshow works with an attached USB stick
Any new .jpg/JPG/jpeg/JPEG file putted into the slideshow hotfolder will be displayed first and
then moved to the USB Stick. If there is no file on the USB Stick the slideshow will display the ads
If there is content on the USB Stick the slideshow will show it´s content in random order and after x pictures a ad.
If there is no USB Stick attached new pictures will be displayed but deleted after.
The USB Stick can be disconnected and reconnected while the slideshow is running

PLEASE READ LICENSING AND COPYRIGHT NOTICES ESPECIALLY IF USING FOR COMMERCIAL PURPOSES