add 'kassandra' command line to the package

setup.cfg

@@ -17,3 +17,7 @@ install_requires =
 
 [options.package_data]
 matrix_bot = py.typed
+
+[options.entry_points]
+console_scripts = 
+	kassandra=kassandra.__main__:main

src/kassandra/__main__.py

@@ -6,7 +6,7 @@ from .bot import send_messages
 from .format import format_alerts
 from .webhook import run_webhook
 
-async def main():
+async def __main():
     parser = argparse.ArgumentParser()
     parser.add_argument("-c", "--config", default="config.yaml")
     args = parser.parse_args()
@@ -39,5 +39,8 @@ async def main():
         webhook_corout
     )
 
+def main():
+    asyncio.run(__main())
+
 if __name__ == "__main__":
-    asyncio.run(main())
+    main()