Add AI Discord and GitHub Community Forum Links to README

[Copilot]

This PR adds community support resources to the README to help users get assistance when building AI applications with this sample.

Changes

1. Added Discord Badge

Added an Azure AI Foundry Discord badge in the badges section (after the GitHub Codespaces badge) to make the community Discord server more discoverable.

2. Added "Getting Help" Section

Created a new "Getting Help" section at the end of the README (positioned before the "Note" section) that includes two community resources:

• Azure AI Foundry Discord - For users who get stuck or have questions about building AI apps
• Azure AI Foundry Developer Forum - For users who have product feedback or encounter errors while building

Both resources are presented as badges using the same for-the-badge style to maintain consistency with the existing README design.

Purpose

These additions make it easier for developers to:

• Find community support when they encounter issues
• Connect with other developers building AI applications
• Provide feedback and report issues through the appropriate channels

The links use the official Azure AI Foundry short URLs:

• Discord: https://aka.ms/foundry/discord
• Forum: https://aka.ms/foundry/forum

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add AI Discord and Forum Links</issue_title>
<issue_description>Title: Add AI Discord and GitHub Community Links

Plan

Locate the README.md file in the root of the project and add the following content at the bottom of the file if "Getting Help" section and the links do not already exist in the README.md file. If the README.md file already contains a section for AI Discord or the Azure AI Foundry Developer Form, do not add the links again.

RULES:

• ONLY MODIFY the README.md file at the root of the repository. DO NOT MODIFY any other files.
• If the "Getting Help" section does not already exists, add it to the bottom of the README.md, but before "Contributing" and "Trademarks" section if they exists at the bottom.
• If there's a badges section in the README.md that do not already include an "AI Community", "Discord" or "AI Discord" (or similar):
  • also add this badge after the Codespaces one (if applicable) [![Join Azure AI Foundry Discord](https://img.shields.io/badge/Discord-Azure_AI_Community-blue?style=flat-square&logo=discord&color=5865f2&logoColor=fff)](https://aka.ms/foundry/discord)
  • if needed, adapt the badge styling to match the other existing badges

## Getting Help

If you get stuck or have any questions about building AI apps, join:

[![Azure AI Foundry Discord](https://img.shields.io/badge/Discord-Azure_AI_Foundry_Community_Discord-blue?style=for-the-badge&logo=discord&color=5865f2&logoColor=fff)](https://aka.ms/foundry/discord)

If you have product feedback or errors while building visit:

[![Azure AI Foundry Developer Forum](https://img.shields.io/badge/GitHub-Azure_AI_Foundry_Developer_Forum-blue?style=for-the-badge&logo=github&color=000000&logoColor=fff)](https://aka.ms/foundry/forum)

</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #239

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