multi line charts documentation not sufficient

[maheshmnj]

The documentation is not enough,please provide some detail documentation on How to use multi lines in in Linechart and please specify what each property is about

[thekeenant]

Maybe check out this example? https://github.com/thekeenant/fcharts/blob/master/example/lib/line/cities.dart

Most of the properties are pretty self explanatory, but more documentation would definitely be useful, I agree.