Feature: Add Business Hours Check Extension Method

[Rekha-Reddyshetty]

Description

This pull request implements a new extension method, IsWithinBusinessHours, for the DateTime class, as discussed in issue 184. The method helps determine if a specific DateTime falls within a given range of business hours. It accepts two TimeSpan parameters, startTime and endTime, and returns true if the given time is between them. If startTime is greater than endTime, the method handles the scenario of business hours spanning across midnight (e.g., from 9 PM to 5 AM).

Key Features:

• Adds the IsWithinBusinessHours extension method to DateTime.
• Supports business hours that span across midnight.
• Returns true if the current DateTime is within the specified working hours, false otherwise.

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