Created a preload.js, small changes in the package.json, main.js, index.html and script.js like removing whitespace

electron/main/main.js

@@ -19,7 +19,7 @@ function createWindow() {
     }
   });
 
-  mainWindow.loadFile('index.html');
+  mainWindow.loadFile('main/index.html');
 }
 
 app.whenReady().then(createWindow);
@@ -40,3 +40,5 @@ ipcMain.handle('convert-video', async (event, filePath) => {
     });
   });
 });
+
+