Add fraction support.
Known Issue:
Using an instance built by default parameterless constructor will cause exception or miscalculation. To avoid this, always use parameter-based constructors. This will not be fixed due to consideration about running speed.
Source code: Github
License: MIT
Nuget: fraction
Supported platform: NetCore 1, NetCore 2, NetFx 4, NetStd 1.3, NetStd 2.0