added placeholder for telemetry dashboard (#5790)

Common/Telemetry/README.md

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+
+
+# Telemetry Analytics
+
+Bot Analytics provides telemetry for analyzing conversation activities.
+
+## Requirements
+
+To enable bot analytics: 
+
+* [Add Telemetry](https://aka.ms/AddBotTelemetry) via Application Insights in the Bot Code
+* [Enable Application Insights](https://docs.microsoft.com/en-us/azure/bot-service/bot-service-resources-app-insights-keys?view=azure-bot-service-4.0) on Azure Bot Service
+
+Once active, basic visualization is available out of the box on Azure Bot Service. In addition, one can deploy and customize more advanced analytics views. 
+
+## Conversation Health Dashboard
+
+The Conversation Health Dashboard template presents analytics view of bot conversation activity. 
+
+<TBD: Are there 2 templates? PBI & AppInsights? Need to describe and provide instructions for both>
+
+### Instructions
+
+<TBD: how to customize and deploy>
+
+
+
+## See Also
+
+* [Analyze Bot Telemetry](https://aka.ms/AnalyzeBotTelemetry) : Learn how to analyze Application Insights log analytics data.
+* See [Azure ARM templates](https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/quickstart-create-templates-use-the-portal) Documentation
+