Add initial methods for file uploading

Implemented placeholders for saving a file in the files service and added a new POST endpoint in the files controller. These changes lay the groundwork for future development of file uploading functionality.

apps/backend/src/app/files/files.controller.ts

@@ -1,16 +1,19 @@
-import { Controller, Get, Param, StreamableFile } from '@nestjs/common';
+import { Controller, Get, Param, Post, StreamableFile } from '@nestjs/common';
 import { FilesService } from "./files.service";
 
 @Controller("files")
 export class FilesController {
 	constructor(private readonly filesService: FilesService) {}
 
-	//TODO the file name, replace spaces to underscore and deliver it via the response
+  //TODO POST FILE
+  @Post('new')
+  async saveFile() {
+
+  }
+
 	@Get(':fileId')
   async getFile(@Param('fileId') fileId: string) {
     return this.filesService.get(fileId);
   }
 
-	//TODO POST FILE
-
 }

apps/backend/src/app/files/files.service.ts

@@ -54,4 +54,11 @@ export class FilesService {
 			disposition: `attachment; filename="${fileNameWithoutSpaces}.${fileInformation.fileType.ext.toLowerCase()}"`
 		});
 	}
+
+	//TODO list the files
+
+	//TODO save a file
+	public async set() {
+
+	}
 }