add missing file

internal/common/pagination.go

@@ -0,0 +1,15 @@
+package common
+
+type Pagination struct {
+	Page    *int `json:"page"`
+	PerPage *int `json:"perPage"`
+}
+
+func (p Pagination) OffsetPerPage(perPageDefault int) (offset int32, perPage int32) {
+	page := int32(DefaultIfNilOrZero(p.Page, 1))
+	perPage = int32(DefaultIfNilOrZero(p.PerPage, perPageDefault))
+
+	offset = (page - 1) * perPage
+
+	return
+}