add sample program testing if a directory can be watched

misc/kqdir.py

@@ -0,0 +1,14 @@
+import aiokq
+import asyncio
+import os
+
+fd = os.open('.', os.O_RDONLY)
+
+async def foo():
+	async with aiokq.watch_file(fd) as wf:
+		print('a')
+		await wf()
+		print('b')
+
+loop = asyncio.get_event_loop()
+loop.run_until_complete(foo())