Add readme doc

Author: Mike Shi

scenarios/evaluate/Azure_OpenAI_Graders/README.md

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+---
+page_type: sample
+languages:
+- python
+products:
+- ai-services
+- azure-openai
+description: Evaluate AI agents with Azure AI Evaluation SDK
+---
+
+
+# Evaluate using Azure OpenAI Graders with Azure AI Foundry SDK
+
+## Overview
+
+This tutorial offers a step-by-step guide for evaluating large language models using Azure OpenAI Graders and their model outputs.
+
+## Objective
+
+The main objective for this tutorial is to help users understand how to utilize the four new AOAI Graders we now support in Azure AI Foundry SDK:
+
+- Model Labeler
+- String Check
+- Text Similarity
+- General Grader
+
+## Programming Languages
+
+- Python
+
+## Estimated Runtime: 15 mins