Add initial implementation of cobot CLI and setup scripts

cobot/commands/setup.py

@@ -0,0 +1,10 @@
+import argparse
+
+
+def register(subparsers):
+    p = subparsers.add_parser("setup", help="First-time project setup")
+    p.set_defaults(func=run)
+
+
+def run(args: argparse.Namespace) -> None:
+    print("cobot setup — TODO: implement setup logic here")