add support for midi devices.

midi example added.

minor version bump

examples/midi/README.md

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+## About/Requirements
+
+A simple demonstration showing how to use a midi controller with this API.
+
+This script was written for and tested with a Korg NanoKontrol2 configured in CC mode.
+
+In order to run this example script you will need to have setup Voicemeeter with a midi device in Menu->Midi Mapping.
+
+## Use
+
+The script launches Voicemeeter Banana version and assumes that is the version being tested (if it was already launched)
+
+`get_info()` responds to any midi button press or midi slider movement and prints its' CC number and most recent value.
+
+`on_midi_press()` should enable trigger mode for macrobutton 0 if peak level value for strip 3 exceeds -40 and midi button 48 is pressed. On the NanoKontrol2 midi button 48 corresponds to the leftmost M button. You may need to disable any Keyboard Shortcut assignment first.
+
+For a clear illustration of what may be done fill in some commands in `Request for Button ON / Trigger IN` and `Request for Button OFF / Trigger OUT`.
+
+## Resources
+
+If you want to know how to setup the NanoKontrol2 for CC mode check the following resources.
+
+-   [Korg NanoKontrol2 Manual](https://www.korg.com/us/support/download/manual/0/159/1912/)
+-   [CC Mode Info](https://i.korg.com/uploads/Support/nanoKONTROL2_PG_E1_634479709631760000.pdf)

examples/midi/__main__.py

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+import voicemeeterlib
+
+
+class Observer:
+    def __init__(self, vm, midi_btn, macrobutton):
+        self.vm = vm
+        self.midi_btn = midi_btn
+        self.macrobutton = macrobutton
+
+    def register(self):
+        self.vm.subject.add(self)
+
+    def on_update(self, subject):
+        if subject == "midi":
+            self.get_info()
+            self.on_midi_press()
+
+    def get_info(self):
+        current = self.vm.midi.current
+        print(f"Value of midi button {current} is {self.vm.midi.get(current)}")
+
+    def on_midi_press(self):
+        if (
+            max(self.vm.strip[3].levels.postfader) > -40
+            and self.vm.midi.get(self.midi_btn) != 0
+        ):
+            print(
+                f"Strip 3 level is greater than -40 and midi button {self.midi_btn} is pressed"
+            )
+            self.vm.button[self.macrobutton].trigger = True
+        else:
+            self.vm.button[self.macrobutton].trigger = False
+            self.vm.button[self.macrobutton].state = False
+
+
+def main():
+    with voicemeeterlib.api(kind_id) as vm:
+        obs = Observer(vm, midi_btn, macrobutton)
+        obs.register()
+
+        while cmd := input("Press <Enter> to exit\n"):
+            if not cmd:
+                break
+
+
+if __name__ == "__main__":
+    kind_id = "banana"
+    # leftmost M on korg nanokontrol2 in CC mode
+    midi_btn = 48
+    macrobutton = 0
+
+    main()