add create categories route

internal/app/mappers.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"git.3crabs.ru/save_my_money/smm_core/internal/services/budget"
+	"git.3crabs.ru/save_my_money/smm_core/internal/services/category"
 	"git.3crabs.ru/save_my_money/smm_core/internal/services/user"
 	proto "git.3crabs.ru/save_my_money/smm_core/proto"
 )
@@ -19,5 +20,23 @@ func mapBudget(budget *budget.BudgetEntity) *proto.Budget {
 		Name:         budget.Name,
 		StartDay:     int32(budget.StartDay),
 		MonthlyLimit: int32(budget.MonthlyLimit),
+		Categories:   mapCategories(budget.Categories),
 	}
 }
+
+func mapCategory(category *category.CategoryEntity) *proto.Category {
+	return &proto.Category{
+		Id:           int32(category.Id),
+		Name:         category.Name,
+		Favorite:     category.Favorite,
+		MonthlyLimit: int32(category.MonthlyLimit),
+	}
+}
+
+func mapCategories(categories []*category.CategoryEntity) []*proto.Category {
+	res := make([]*proto.Category, 0, len(categories))
+	for _, item := range categories {
+		res = append(res, mapCategory(item))
+	}
+	return res
+}