add example description

Author: todbot

examples/tmidi_simple_receiver.py

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: Copyright (c) 2024 Tod Kurt
+#
+# SPDX-License-Identifier: MIT
+
+# This example shows how to receive MIDI NoteOn and NoteOff messages
+
+import usb_midi
+import tmidi
+
+midi_usb = tmidi.MIDI(midi_in=usb_midi.ports[0], midi_out=usb_midi.ports[1])
+
+while True:
+    if msg := midi_usb.receive():
+        if msg.type == tmidi.NOTE_ON and msg.velocity > 0:
+            print("note on: ", msg.note, msg.velocity)
+        elif msg.type == tmidi.NOTE_OFF or msg.velocity == 0:
+            print("note off:", msg.note, msg.velocity)