Improve file handling in saveFile method

Added comments to clarify the buffer management in the file save process. This enhances code readability and maintenance.

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

@@ -89,7 +89,9 @@ export class FilesController {
 	@Post("new")
 	async saveFile(@Req() req: IncomingMessage, @Res() res: Response) {
 		let fileBuffer: Buffer = Buffer.from([]);
+		//On row of a file
 		req.on("data", (chunk: Buffer) => {
+			// Represents a buffer for handling file operations.
 			fileBuffer = Buffer.concat([fileBuffer, chunk]);
 		});