Add new features(Specify the end date)

[HashCookie]

1. Introduced a new command-line argument --end_date:

• Within the arguments function, Added a new argument -ed or --end_date that allows users to specify an end date for the commits.

2. Calculated the total number of days for commits:

• In the main function, Added a conditional check to see if the --end_date argument was provided.
• If --end_date was given, Calculated the number of days from start_date to end_date and stored it in the total_days variable.
• If --end_date wasn't provided, then total_days is the sum of days_before and days_after.

3. Modified the commit loop:

• Adjusted the primary for loop to use total_days as its range instead of the original days_before + days_after.

4. Removed redundant code:

• Removed a redundant if args.end_date: block since total_days was already calculated in the previous code.

With these modifications, the following features have been added to the script:

• Allow users to specify an end date for commits.
• Calculate the total number of days for commits based on the specified end date.
• Ensure commits are made within the specified date range.