outgoing letter is read

internal/contract/letter_outgoing_contract.go

@@ -110,6 +110,7 @@ type OutgoingLetterResponse struct {
 	CreatedBy             uuid.UUID                          `json:"created_by"`
 	CreatedAt             time.Time                          `json:"created_at"`
 	UpdatedAt             time.Time                          `json:"updated_at"`
+	IsRead            	  bool                               `json:"is_read"`
 	Recipients            []OutgoingLetterRecipientResponse  `json:"recipients,omitempty"`
 	Attachments           []OutgoingLetterAttachmentResponse `json:"attachments,omitempty"`
 	Approvals             []OutgoingLetterApprovalResponse   `json:"approvals,omitempty"`
@@ -139,6 +140,7 @@ type ListOutgoingLettersRequest struct {
 	SortBy                string     `form:"sort_by" json:"sort_by,omitempty"`
 	SortOrder             string     `form:"sort_order" json:"sort_order,omitempty"`
 	IsArchived            *bool      `form:"is_archived" json:"is_archived,omitempty"`
+	IsRead          	  *bool      `form:"is_read,omitempty"`
 }
 
 type ListOutgoingLettersResponse struct {