Add README for Enhance Incident with Linked Problem Business Rule

Author: harshal045

Server-Side Components/Business Rules/EnhanceIncidentWithProblem/README.md

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+# Enhance Incident Description with Linked Problem Statement
+
+## Overview
+This ServiceNow Business Rule enhances Incident records by automatically appending the short description of a linked Problem record. It improves visibility and context for support teams working on related incidents.
+
+## Features
+- Triggered when a Problem ID is newly linked or changed on an Incident.
+- Fetches the Problem's short description and number.
+- Appends the Problem Statement to both the Incident's short description and description fields.
+- Includes general error handling to ensure stability.
+
+## Business Rule Configuration
+- Table: `incident`
+- When to Run: `before insert` and `before update`
+- Condition: 
+  ```javascript
+  current.problem_id.changes() || !previous