Load and print dataset preview

📂 Task: Load the data.csv file using Pandas and print the first few rows of the DataFrame.
📌 File to modify: main.ipynb

✅ Expected Output:

Load CSV using pd.read_csv()
Print .head() to display the dataset preview

💡 Add comments to help beginners understand the process.

The file to modify is main.ipynb. Use pd.read_csv('data.csv') to load the dataset, then print the result of .head() to show the first few rows. Add comments explaining each step. Run the notebook cell to verify the output matches the expected preview.

索引モデルが issue の本文から書いたものです。