add missing files

qmdx/__init__.py

@@ -0,0 +1 @@
+from .utils import join_pipelines, get_git_root, get_dir_path

qmdx/cli.py

@@ -0,0 +1,9 @@
+from os import environ as env
+
+from click import option, argument
+
+shell_exec_opt = option('-s', '--shell-executable', help=f'Shell to use for executing commands; defaults to $SHELL ({env.get("SHELL")})')
+no_shell_opt = option('-S', '--no-shell', is_flag=True, help="Don't pass `shell=True` to Python `subprocess`es")
+verbose_opt = option('-v', '--verbose', is_flag=True, help="Log intermediate commands to stderr")
+exec_cmd_opt = option('-x', '--exec-cmd', 'exec_cmds', multiple=True, help='Command(s) to execute before invoking `comm`; alternate syntax to passing commands as positional arguments')
+args = argument('args', metavar='[exec_cmd...] <path1> <path2>', nargs=-1)