Added Teams guide to documentation

[shrinip-dev]

Purpose

This pull request includes addition to the documentation providing a step-by-step guide for creating a Teams App Interface for the Enterprise GPT-RAG Solution Accelerator using the Teams toolkit.

Type of change

Documentation content changes:
The guide covers prerequisites, high-level steps for building, testing, deploying, and publishing the Teams App. Key sections include creating a new Teams App, connecting it to the GPT-RAG Orchestrator, provisioning and deploying Azure resources, building the app, and finally publishing it.

• Updated GUIDE.md: Added reference to Teams Guide.
• New markdown files added: TEAMS_INTEGRATION_MAIN.md, TEAMS_INTEGRATION_STEP1.md, TEAMS_INTEGRATION_STEP2.md, TEAMS_INTEGRATION_STEP3.md, TEAMS_INTEGRATION_STEP4.md, TEAMS_INTEGRATION_STEP5.md.
• Associated media files.

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