add bitelab as a script to get installed, display usage if no commands..

bitelab/__main__.py

@@ -159,6 +159,9 @@ async def real_main():
 
 			brd = Board.parse_obj(res.json())
 			output_board(brd)
+		else:
+			parser.print_usage()
+			sys.exit(5)
 
 	finally:
 		await client.aclose()

setup.py

@@ -30,4 +30,9 @@ setup(
     extras_require = {
         'dev': [ 'coverage' ],
     },
+    entry_points={
+        'console_scripts': [
+            'bitelab = bitelab.__main__:main',
+        ]
+    }
 )