Add initial CLI support

trovedb/cli/ls.py

@@ -0,0 +1,16 @@
+"""Note List"""
+import argparse
+from trovedb.cli import CliEnv
+
+def setup(parser: argparse.ArgumentParser) -> None:
+    """Configure this subcommand's arguments."""
+    pass
+
+def run(env: CliEnv, args: argparse.Namespace) -> None:
+    """Entry point when this subcommand is invoked."""
+
+    trove = env.checked_trove()
+    for entry in trove.get_root().entries():
+        print(entry)
+
+