update swagger

src/subscriptions/dto/salon-sms-balance.dto.ts

@@ -0,0 +1,12 @@
+import { ApiProperty } from '@nestjs/swagger';
+
+export class SalonSmsBalanceDto {
+  @ApiProperty({ example: 100 })
+  freeSmsRemaining: number;
+
+  @ApiProperty({ example: 250 })
+  purchasedSmsRemaining: number;
+
+  @ApiProperty({ example: 350 })
+  totalRemaining: number;
+}