feat: Initialize backend with NestJS framework and serial communication

- Added package.json for backend dependencies and scripts.
- Implemented basic AppController and AppService with a simple "Hello World!" endpoint.
- Created SerialModule for handling serial communication with the Pico.
- Developed SerialController and SerialService to manage serial ports and commands.
- Implemented event streaming for serial data.
- Added Jest tests for AppController and e2e tests for the application.
- Set up TypeScript configuration for the backend.
- Created frontend SendBox component for sending commands to the backend.
- Established Pico firmware for controlling a stepper motor via serial commands.
- Documented project structure and usage in README files.

backend/src/serial/serial.module.ts

@@ -0,0 +1,10 @@
+import { Module } from '@nestjs/common';
+import { SerialService } from './serial.service';
+import { SerialController } from './serial.controller';
+
+@Module({
+  providers: [SerialService],
+  controllers: [SerialController],
+  exports: [SerialService],
+})
+export class SerialModule {}