Add some notes why we have a modified copy of URIHandlerAdapter.cs
Add some notes why we have a modified copy of URIHandlerAdapter.cs

freedesktop-unofficial-mirror/gstreamer__gstreamer-sharp,GStreamer/gstreamer-sharp,freedesktop-unofficial-mirror/gstreamer__gstreamer-sharp,Forage/gstreamer-sharp,GStreamer/gstreamer-sharp,gstreamer-sharp/gstreamer-sharp,gstreamer-sharp/gstreamer-sharp,GStreamer/gstreamer-sharp,Forage/gstreamer-sharp,freedesktop-unofficial-mirror/gstreamer__gstreamer-sharp,Forage/gstreamer-sharp,gstreamer-sharp/gstreamer-sharp,Forage/gstreamer-sharp