describe submission limit

content.py

@@ -33,6 +33,8 @@ To submit your model predictions:
 3. **Select the evaluation type** that matches your prediction file
 4. **Upload your file** and click Submit
 
+Users are limited to 5 successful submissions per month for each evaluation type.
+
 **Important Notes:**
 - Ensure your prediction file format matches the expected format for the selected evaluation
 - Your email will be stored privately and only used for communication regarding your submission