updating user manual

...mentation/User Manual/3-simulation-models/ADAS_EcoRoll.md

...tation/User Manual/3-simulation-models/Engine_DualFuel.md

...n/User Manual/3-simulation-models/Engine_FC_Correction.md

...ation/User Manual/3-simulation-models/Engine_StartStop.md

...entation/User Manual/3-simulation-models/GearShift_AMT.md

...mentation/User Manual/3-simulation-models/GearShift_MT.md

Documentation/User Manual/3-simulation-models/whr_system.md

Documentation/User Manual/5-input-and-output-files/VSUM.md

Documentation/User Manual/files.txt