Merge pull request 'Added solved_count to listproblems endpoint' (#2) from listproblems-solved-count into develop

Reviewed-on: #2
Reviewed-by: Vyacheslav Birin <vyacheslav1557@noreply.localhost>
Reviewed-by: Holoti <holoti@noreply.localhost>

internal/models/problem.go

@@ -32,6 +32,7 @@ type ProblemsListItem struct {
 	TimeLimit   int32     `db:"time_limit"`
 	CreatedAt   time.Time `db:"created_at"`
 	UpdatedAt   time.Time `db:"updated_at"`
+	SolvedCount int32     `db:"solved_count"`
 }
 
 type ProblemsList struct {