Initial full commit.
Initial full commit. ohgod i am not good at computers.
Added IUnit for implementation of conversions in DerivedMeasurement.cs. Changed LengthUnit & MassUnit to implement IUnit. Updated README
More tests + Initial version of TimeUnit and TemperatureUnit.cs. Added xml documentation to undocumented structs.
Few more structs built
SubstanceUnit.cs + other tweaks. Still not complete testing model yet.
+ LuminosityUnit.cs