Initial commit of Document Retrieval Evaluator sample

Author: Abby Hartman

scenarios/evaluate/Supported_Evaluation_Metrics/Document_Retrieval_Evaluation/.env.sample

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+# Azure AI Search configuration
+AZURE_AI_SEARCH_ENDPOINT=
+AZURE_AI_SEARCH_KEY=
+
+# Optional configuration for integrated vectorization
+AZURE_AI_SEARCH_VECTORIZER_ENDPOINT=
+AZURE_AI_SEARCH_VECTORIZER_KEY=
+AZURE_AI_SEARCH_VECTORIZER_MODEL_NAME=
+AZURE_AI_SEARCH_VECTORIZER_DEPLOYMENT_NAME=
+AZURE_AI_SEARCH_VECTORIZER_MODEL_DIMENSIONS=
+
+# Azure AI Project config
+AZURE_SUBSCRIPTION_ID=
+AZURE_RESOURCE_GROUP=
+AZURE_PROJECT_NAME=
+AZURE_PROJECT_CONNECTION_STRING=