Add .gitignore file and main.py script

.gitignore

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+**/venv
+**/__pycache__
+**/.DS_Store

main.py

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+from datasets import load_dataset, DatasetDict
+
+# Load your dataset from a local JSONL file
+dataset = load_dataset("json", data_files="listing.jsonl")
+
+# Split the dataset into train and temp
+split_dataset = dataset["train"].train_test_split(test_size=0.3)
+
+train_dataset = split_dataset["train"]
+temp_dataset = split_dataset["test"]
+
+# Split the temp dataset into validation and test
+split_temp_dataset = temp_dataset.train_test_split(test_size=0.2)
+
+validation_dataset = split_temp_dataset["train"]
+test_dataset = split_temp_dataset["test"]
+
+# Combine all splits into a DatasetDict
+final_dataset = DatasetDict(
+    {"train": train_dataset, "validation": validation_dataset, "test": test_dataset}
+)
+
+# Save the split datasets to disk
+final_dataset.save_to_disk("listing.jsonl")