add interface example definition for beginners

Author: mgiaco

examples/send_one.py

@@ -3,7 +3,10 @@
 
 
 def send_one():
-    bus = can.interface.Bus()
+    bus = can.interface.Bus(bustype='pcan', channel='PCAN_USBBUS1', bitrate=250000)
+    #bus = can.interface.Bus(bustype='ixxat', channel=0, bitrate=250000)
+    #bus = can.interface.Bus(bustype='vector', app_name='CANalyzer', channel=0, bitrate=250000)
+
     msg = can.Message(arbitration_id=0xc0ffee,
                       data=[0, 25, 0, 1, 3, 1, 4, 1],
                       extended_id=True)