add mechanisms for finding and pinging maintainers

lib/python/qmk/cli/list/maintainers.py

@@ -0,0 +1,16 @@
+"""List the keymaps for a specific keyboard
+"""
+from pathlib import Path
+
+from milc import cli
+
+from qmk.maintainers import maintainers
+
+
+@cli.argument("files", type=Path, arg_only=True, nargs='*', help="File to check")
+@cli.subcommand("List the maintainers for a file.")
+def list_maintainers(cli):
+    """List the maintainers for a file.
+    """
+    for file in cli.args.files:
+        cli.echo('%s: %s', file, ', '.join(maintainers(file)))