Update readme.md

Author: zackha

readme.md

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-# excel-file-splitter-python
- This Python script splits a large Excel file into smaller files with a specified number of rows. It uses the `pandas` library to handle the Excel data and `tkinter` for a simple file selection dialog.
+# Excel File Splitter
+
+This Python script splits a large Excel file into smaller files with a specified number of rows. It uses the `pandas` library to handle the Excel data and `tkinter` for a simple file selection dialog.
+
+## Requirements
+
+- Python 3.x
+- pandas
+- openpyxl
+- tkinter
+
+You can install the required packages using pip:
+
+```bash
+pip install pandas openpyxl tk
+```
+
+## Usage
+
+1. Clone this repository or download the script.
+2. Run the script. A file dialog will open to allow you to select the Excel file you want to split.
+3. The script will split the selected file into chunks of 1000 rows each and save them as `part_1.xlsx`, `part_2.xlsx`, etc.
+
+## Example
+
+Suppose you have an Excel file named `large_file.xlsx` with 5000 rows. Running the script will create the following files:
+
+- `part_1.xlsx` (rows 1 to 1000)
+- `part_2.xlsx` (rows 1001 to 2000)
+- `part_3.xlsx` (rows 2001 to 3000)
+- `part_4.xlsx` (rows 3001 to 4000)
+- `part_5.xlsx` (rows 4001 to 5000)
+
+## Notes
+
+- Ensure that the Excel file you select is properly formatted and does not contain any corrupted data.
+- The script does not preserve any formulas or formatting from the original Excel file. It only copies the raw data.
+
+## License
+
+This project is licensed under the MIT License.