Add a simple cat (path handling still needed)

trovedb/cli/cat.py

@@ -0,0 +1,22 @@
+"""Note List"""
+import argparse
+import sys
+
+from trovedb.cli import CliEnv
+
+def setup(parser: argparse.ArgumentParser) -> None:
+    """Configure this subcommand's arguments."""
+    parser.add_argument('-u', '--unbuffered', action='store_true',
+        help="Output raw bytes, without any decoding.")
+    parser.add_argument('notes', nargs='+', metavar='FILENAME',
+                        help="One or more notes to process.")
+
+
+def run(env: CliEnv, args: argparse.Namespace) -> None:
+    """Entry point when this subcommand is invoked."""
+
+    # TODO: Resolve path!
+    for note in args.notes:
+        sys.stdout.buffer.write(env.local_trove.get_root().child(note).read_content())
+
+