Remove spreadsheet and add issue templates
Add cross test procedure
Improve cross test procedure and formatting
New instructions for tools without BPMN XML support
Add email template and hint on JSON file
Format issue templates
Update repo structure
Update TOC
Update README.md
Remove HTML fragments
Add cross test results to repo structure
Replace Spreadsheet by JSON and HTML table
Add roundtrip to email template
Merge pull request #188 from camunda/testing-turial-v2

Add cross test procedure and replace spreadsheet by HMTL table & JSON files
Add links to JSON files