Create an example for tumbling windows trigger

[cosh]

Right now there is just an example for the scheduled trigger in Lab 7. However there is a need to explain how to create a tumbling Windows trigger.
expected Content:

• How to create a tumbling window trigger
• How to Hand over the Parameters for window start time and window end time to an activity
• Example: load data from a blob with a Directory structure like /yyyy/mm/dd/hh/Content.csv using a databricks Notebook for a given tumbling window