I have a Project based Calendar template on a digital market and I would like to improve my product based on Project Manager's (or related Persons') ideas. But I would like to know that, is it allowed to put my product url to the question (question will be; what you will need more to select this product to buy) for illustrate the work? Thanks.
First of all, thanks for asking on Meta first :)
TL;DR: highly likely to be considered offtopic.
Although self promotion could be OK from a StackOverflow perspective (also HERE and HERE), I don't see any way you could raise a question with PM perspective that you'd answer and won't fall into the off-topic software recommendations category.
If you can overcome the software recommendation barrier, go ahead ns answer. :)