Advertisement Plugin for Yourls Shorten Url Script?

Just registered here and hope gurus will help me in my issue as I’m totally a newbie in php/javascript.
I installed Yourls (Url Shorterning Script, its working fine. But I want to add a feature which can show an Advertisement page for 5-10 seconds before redirecting user to the destination page.
I have read on their (Yourls) site that plugins are best way to add any feature. But unfortunately, my knowledge of php is zero.
I will be very grateful if any one can help me…
Any suggestions or advices are warmly welcome.
This is their latest version of Yourls script:

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