Add guide - How to associate policy pack to specific resource

[rajlearner17]

Guide purpose
A clear and concise description of what the guide aims to achieve and why it's important.

Target audience
Specify who this guide is intended for (e.g., beginners, advanced users, specific roles).

Categories
Proposed primary category and categories where this guide would fit best. (e.g., Getting Started, Best Practices, Troubleshooting, Concepts etc).

Outline
A brief outline of the main sections or topics the guide will cover.