Create .gitnore

.gitnore

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+runtime error
+Exit code: 1. Reason: 2025-07-01 02:51:53,925 - INFO - 🚀 Starting AI Dataset Studio...
+2025-07-01 02:51:53,925 - INFO - 📊 Features: ✅ AI Models | ✅ Advanced NLP | ✅ HuggingFace Integration
+2025-07-01 02:51:53,926 - ERROR - ❌ Failed to launch application: name 'DatasetStudio' is not defined
+Traceback (most recent call last):
+  File "/home/user/app/app.py", line 1373, in <module>
+    interface = create_modern_interface()
+  File "/home/user/app/app.py", line 725, in create_modern_interface
+    studio = DatasetStudio()
+NameError: name 'DatasetStudio' is not defined