List posts by topic

[bencagri]

as a Developer;

I need to create a route GET /{topic-name}
I should create a method to list posts in post controller.
I should look for topicModel.slug in db.
If I dont find any topic, end-user should see 404 not found page.
If I find topic, end user see posts with pagination.

I need to use, post service, post repository and post model