Add message linking to copier template and exit before prompts

hooks/pre_prompt.py

@@ -0,0 +1,19 @@
+import sys
+
+
+if __name__ == '__main__':
+    print("\n\n\n")
+    print("#" * 80)
+    print("The napari cookiecutter plugin template has been replaced with a copier template!")
+    print()
+    print("To create a plugin using the new template, run:")
+    print()
+    print("python -m pip install copier jinja2-time")
+    print("python -m pip install npe2")
+    print("copier copy --trust https://github.com/napari/napari-plugin-template new-plugin-name")
+    print()
+    print("For more information, refer to the template README:")
+    print("https://github.com/napari/napari-plugin-template")
+    print("#" * 80)
+    print("\n\n\n")
+    sys.exit(1)