Merge pull request Azure-Samples#106 from Azure-Samples/algattik/iot-…

…telemetry-simulator

Use Iot-Telemetry-Simulator

Spelling (Azure-Samples#101)

Spelling (Azure-Samples#101)

added timeseries query sample

Use Spark 3 in Data Explorer Sample (Azure-Samples#98)

Also:
- automatically generate PAT token for Databricks
- added README about continuous export for Data Explorer

Use Spark 3 in Data Explorer Sample (Azure-Samples#98)

Also:
- automatically generate PAT token for Databricks
- added README about continuous export for Data Explorer

updated readme

updated readme

improved index definition

updated readme