configured base route and setup healthcheck endpoint

src/app.module.ts

@@ -1,10 +1,11 @@
 import { Module } from '@nestjs/common';
 import { AppController } from './app.controller';
-import { AppService } from './app.service';
+import { ExpensesService } from './services/expenses.service';
+import { ExpensesController } from './controllers/expenses/expenses.controller';
 
 @Module({
   imports: [],
-  controllers: [AppController],
-  providers: [AppService],
+  controllers: [AppController, ExpensesController],
+  providers: [ExpensesService],
 })
 export class AppModule {}