docs(testdata): adds docs page about test datasource

docs/sources/features/datasources/testdata.md

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+title = "Testdata Panel"
+keywords = ["grafana", "dashboard", "documentation", "panels", "testdata"]
+type = "docs"
+[menu.docs]
+name = "Test data"
+parent = "datasources"
+weight = 2
++++
+
+
+# Test data Panel
+
+    > NOTE: This panel is disable by default. 
+
+## Purpose
+The purpose of this data sources is to make it easier to create fake data for any panel. 
+Using `Grafana TestData` you can build your own time series and have any panel render it. 
+This make is much easier to verify functionally since the data can be shared very 
+
+## Enable 
+
+`Grafana TestData` is not enabled by default. To enable it you have to go to `/plugins/testdata/edit` and click the enable button.
+
+## Create mock data.
+
+Once `Grafana TestData` is enabled you use it as a datasource in the metric panel.
+
+![](/img/docs/v41/test_data_add.png)
+
+## Scenarios
+
+You can now choose different scenario that you want rendered in the drop down menu. If you have scenarios that you think should be added, please add them to `` and submit a pull request.
+
+## CSV
+
+The comma separated values scenario is the most powerful one since it lets you create any kind of graph you like. 
+Once you provided the numbers `Grafana TestData` will distribute them evenly based on the time range of your query. 
+
+![](/img/docs/v41/test_data_csv_example.png)
+
+
+## Dashboards
+
+`Grafana TestData` also contains some dashboards with example. `/plugins/testdata/edit`
+
+### Commit updates to the dashboards
+
+If you want to submit a change to one of the current dashboards bundled with `Grafana TestData` you have to update the revision property. 
+Otherwise the dashboard will not be updated automatically for other Grafana users.
+
+## Using test data in issues
+
+If you post an issue on github regarding time series data or rendering of time series data we strongly advice you to use this data source to replicate the data. 
+That makes it much easier for the developers to replicate and solve the issue you have.