Added file "Test-execution.md" with information on the TDL execution

## Test execution

The TOP tool supports execution of complete TDL models. 

The model is translated to java code and the TOP tool provides components to interface a

test with the SUT.

## Test result analysis

The TDL execution feature provides a Report component that enables logging of events which

is the basis for test result analysis. It allows events during a test execution to be logged 

and hence these event traces may be used to check the result of a test.

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