Add swm adserver links (#258)

## Description

Add adserver links

Author: Magmusacy

README.md

@@ -1,3 +1,7 @@
+[![Ad](https://swm-delivery.com/www/images/zone-gh-fishjam-1?n=1)](https://swm-delivery.com/www/delivery/ck.php?zoneid=zone-gh-fishjam-1&n=1)
+[![Ad](https://swm-delivery.com/www/images/zone-gh-fishjam-2?n=1)](https://swm-delivery.com/www/delivery/ck.php?zoneid=zone-gh-fishjam-2&n=1)
+[![Ad](https://swm-delivery.com/www/images/zone-gh-fishjam-3?n=1)](https://swm-delivery.com/www/delivery/ck.php?zoneid=zone-gh-fishjam-3&n=1)
+
 # Fishjam Documentation
 
 You can access generated documentation here: <https://docs.fishjam.io>