Added "Inverter" example

examples/inverter.py

@@ -0,0 +1,19 @@
+from snanosm.mealy import Machine
+
+def add_to_result(context, c):
+    context["result"] += c
+
+def inverter(input_string: str) -> str:
+    context = {
+        "result": ""
+    }
+    m = Machine(context)
+    m.add_state("S", True, False)
+    m.add_transition("0", "S", "S", lambda ctx: add_to_result(ctx, "1"))
+    m.add_transition("1", "S", "S", lambda ctx: add_to_result(ctx, "0"))
+    for c in input_string:
+        m.process_input(c)
+    return context["result"]
+
+if __name__ == '__main__':
+    print(inverter("000011110010"))