Initialize NestJS project with essential configuration files and structure

- Added .env.example for application timezone configuration.
- Created .gitignore to exclude unnecessary files and directories.
- Introduced Prettier configuration in .prettierrc for code formatting.
- Set up ESLint configuration in eslint.config.mjs for code quality checks.
- Added nest-cli.json for NestJS project settings.
- Created package.json with project dependencies and scripts for building, testing, and running the application.
- Generated pnpm-lock.yaml for package management.
- Added README.md with project description and setup instructions.
- Created initial application structure with AppModule, AppController, and AppService.
- Implemented basic unit and e2e tests for the application.

src/app.service.ts

@@ -0,0 +1,8 @@
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class AppService {
+  getHello(): string {
+    return 'Hello World!';
+  }
+}