add folder operation and use createQueryRunner

src/Operations/operations.module.ts

@@ -0,0 +1,15 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Student } from 'src/alumno/entities/student.entity';
+import { DetalleServicio } from 'src/detalle_servicio/entities/detalle_servicio.entity';
+import { OperationsController } from './operations.controller';
+import { OperationsService } from './operations.services';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([Student, DetalleServicio]), // entidades que usarán las transacciones
+  ],
+  controllers: [OperationsController],
+  providers: [OperationsService],
+})
+export class OperationsModule {}