Add AI Discord and Forum Links

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.

## 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)

Start with README.md at the repository root and check whether a Getting Help section or Azure AI Foundry Discord and Developer Forum links already exist. Update only that file, adding the specified links when absent; done means the links are present once and no other files are changed.