Adds GeneralTest_TimeSpan unit test.
Implements stub parsing of TimeSpan
Draft implementation of TimeSpan literal evaluation
WIP. Adds TimeSpan addition unit cases. Adds todo comments
Adds Readme.md
Update Readme.md
Implements addition for TimeSpan types. GeneralTest_TimeSpan pass.
Merge branch 'master' into TimeSpan
Implements addition using methods of the target class. Implements subtraction for TimeSpan (and any other) type.
Implements selection of math method using appropriate type parameters.
Cleans up unit tests.
Merge branch 'TimeSpan' into develop
Adds two failed unit test: Parentheses and UnarySigns