feat: adding GitHub Copilot instructions file

[chdaly]

Purpose

Remove the restriction on having a custom-instructions.md file in the .github directory. Created a verbose custom-instructions.md file to help give additional context to GitHub Copilot when someone is using it.

• ...

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[chdaly]

@microsoft-github-policy-service agree company="Microsoft"

[Roopan-Microsoft]

Thanks @chdaly for your contribution here. We will validate and include this.

[Copilot]

Pull Request Overview

This PR adds a new GitHub Copilot custom instructions file to remove the restriction on having a custom-instructions.md file in the .github directory.

• Added a detailed instructions file outlining guidelines on coding standards, security, and Azure best practices.
• Provides clear guidelines for both backend and frontend development processes.