Update homework.md

Author: alexeygrigorev

cohorts/2025/03-data-warehouse/homework.md

@@ -92,3 +92,8 @@ It is best practice in Big Query to always cluster your data:
 
 ## (Bonus: Not worth points) Question 8:
 No Points: Write a `SELECT count(*)` query FROM the materialized table you created. How many bytes does it estimate will be read? Why?
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+## Submitting the solutions
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+Form for submitting: https://courses.datatalks.club/de-zoomcamp-2025/homework/hw3