feat(cli): added warning about ignoring --project when trying to apply new command

Author: finswimmer

Diff for: src/poetry/console/commands/new.py

@@ -34,6 +34,12 @@ def handle(self) -> int:
         from poetry.layouts import layout
         from poetry.utils.env import SystemEnv
 
+        if self.io.input.option("project"):
+            self.line_error(
+                "<warning>--project only makes sense with existing projects, and will"
+                " be ignored. You should consider the option --path instead.</warning>"
+            )
+
         if self.option("src"):
             layout_cls = layout("src")
         else: