Create README.md

Author: Soumyadeep10

Client-Side Components/Catalog Client Script/Return Date Validation/README.md

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+This piece of code runs in an OnChange catalog client script for the field 'u_return_date' and validates the return date(u_return_date) in a ServiceNow Catalog item form to ensure:
+
+1. A start date(u_start_date) is entered before setting a return date(u_return_date).
+2. The return date is within 6 months after the start date.
+3. Return date is not the start date or before that.
+
+Let’s say with an example:
+
+  u_start_date = 2025-10-01
+  You enter u_return_date = 2026-04-15
+  
+  Steps:
+  a)Difference = 196 days → More than 180 days
+  b)Result: u_return_date is cleared and error shown: “Select Return Date within 6 months from Start Date”
+