Add readme.md file for more information to code context.

Author: dadhich-ashish

Catalog Client Script/MRVS Email Validation with Mutation Observer/readme.md

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+# Email Validation on Catalog UI
+
+This file contains a client script that validates email addresses in the MRVS (Multi-Row Variable Set) field using a MutationObserver. The script ensures that duplicate email addresses are not allowed in the catalog.
+
+## File Structure
+
+- `/code-snippets/Catalog Client Script/MRVS Email Validation with Mutation Observer/EmailValidationOnCatalogUI.js`
+
+## Description
+
+The script observes changes in the MRVS field and validates the email addresses whenever a user attempts to add another email. If a duplicate email address is found, an error message is displayed, and the submit button is disabled.
+
+## Usage
+
+1. **onLoad Function**: This function initializes the MutationObserver to watch for changes in the MRVS field.
+2. **validateUserDetails Function**: This function checks for duplicate email addresses in the MRVS field.
+
+## How It Works
+
+1. The `onLoad` function sets up a MutationObserver on the MRVS field.
+2. When changes are detected, the `validateUserDetails` function is called to check for duplicate email addresses.
+3. If duplicates are found, an error message is displayed, and the submit button is disabled.