Feature/new snippet (#2395)

* Add dedicated README for onChange email validation script

* Add onChange email validation script for real-time feedback

Author: Dhruvyadav2000

Client-Side Components/Catalog Client Script/Real-Time Email Validation/README.md

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+# ServiceNow Email Validation - onChange Script
+
+## Overview
+Real-time email validation script for ServiceNow catalog items that provides instant feedback as users type in email fields.
+
+## Features
+- Real-time validation during user input
+- Instant error/success messages
+- Dynamic message clearing based on validity
+- User-friendly feedback with examples
+- No form submission required for validation
+
+## Implementation
+1. Navigate to **Service Catalog > Catalog Client Scripts**
+2. Click **New** to create a new script
+3. Select your **Catalog Item**
+4. Set **Type** to **onChange**
+5. Set **Variable name** to your email field variable
+6. Replace `email_field_name` with actual variable name in script
+7. Paste the script code
+8. Check **Active** checkbox
+9. Save
+
+## Validation Rules
+- Required format: `user@domain.com`
+- Accepts: letters, numbers, dots (.), underscores (_), hyphens (-)
+- Minimum 2-character top-level domain
+
+## User Experience
+- **Invalid Input**: Red error message displayed below field
+- **Valid Input**: Green info message confirming valid format
+- **Empty Field**: No validation performed
+- **While Loading**: Validation skipped to prevent false errors
+
+## Benefits
+- Immediate feedback reduces user frustration
+- Prevents errors before form submission
+- Improves data quality
+- Enhances overall user experience

Client-Side Components/Catalog Client Script/Real-Time Email Validation/email_validation_onChange.js

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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || newValue === '') {
+        return;
+    }
+    
+    // Regular expression for email validation
+    var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
+    
+    // Test the email against the pattern
+    if (!emailPattern.test(newValue)) {
+        g_form.showFieldMsg('email_field_name', 'Invalid email format. Example: user@example.com', 'error');
+        g_form.hideFieldMsg('email_field_name', true); // Clear info messages
+    } else {
+        g_form.hideFieldMsg('email_field_name'); // Clear error message
+        g_form.showFieldMsg('email_field_name', 'Valid email address', 'info');
+    }
+}