Update README.md

Author: ccrisan

README.md

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 **motionPie** is a Linux distribution that turns your single board computer into a video surveillance system. Check out the [wiki](https://github.com/ccrisan/motionPie/wiki) for more details.
 
 Follow us on facebook: [https://www.facebook.com/motionpie](https://www.facebook.com/motionpie).
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+You can support the development of motionPie by making a small donation.
+<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=ccrisan%40gmail%2ecom&lc=US&item_name=motionPie&no_note=0&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHostedGuest"><img src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif" alt="[paypal]" /></a>