added cost observability v2 dashboard and readme (#487)

Author: pohlposition

cost-observability/Account Usage Dashboard v2.lvdash.json

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+# README: Databricks Usage Dashboard v2.0
+
+## Overview
+
+This is version 2.0 of the popular [Usage Dashboard](https://docs.databricks.com/aws/en/admin/account-settings/usage), which provides users granular visibility into all billable usage across their Databricks account. 
+
+All the usages in this dashboard are calculated based on the list price in USD unless the Global Filter 'Price Table' is toggled to use account\_prices instead.
+
+*Note: This dashboard is not yet officially supported by Databricks, and still in preview. New updates to this version of the dashboard may be periodically released.*
+
+Version 2.0 comes with a series of advanced functionality that leverages the best of new AI/BI Dashboard features. This dashboard helps answer:
+
+* **Total actual and forecasted spend**   
+  * What is total spend across your account? By workspace? By product?  
+  * What is the forecasted total spend?  
+* **Top spend drivers**  
+  * What are the top 10 objects, by cost, in your account?  
+  * Who owns the top objects, by cost, that match a certain tag? In which workspaces are they located?  
+* **Spend breakdown by tags**  
+  * What are the most popular tags (key, value pairs) in your account?  
+  * What is the total spend tagged by specific key, value pairs?
+
+## Data source
+
+The dashboard is built on top of the following system tables:
+
+* system.access.workspaces\_latest  
+* system.billing.usage  
+* system.billing.list\_prices  
+* system.access.clean\_room\_events  
+* system.serving.served\_entities  
+* system.compute.clusters  
+* system.lakeflow.jobs  
+* system.lakeflow.pipelines  
+* system.compute.warehouses
+
+Users must have access to the above system tables in order to use the dashboard. 
+
+## Installation Instructions
+
+* Users can then [easily import it](https://docs.databricks.com/aws/en/dashboards/#import-a-dashboard-file) into their workspace of choice to load the dashboard.   
+* Note on prerequisites: User should have system table access to view the dashboard.
+
+## Support
+
+Soon, this dashboard will be accessible directly in the product, like the current Usage Dashboard in Public Preview.  Admins can locate and import the dashboard directly from the Account Console in a few clicks. 
+
+In the meantime, we are collecting feedback on the usability and performance of Usage Dashboard v2.0.  **Please share any feedback with your account team or [[email protected]](mailto:[email protected])  directly**. We appreciate you testing out this feature early\!
+