Add documentation to ChartBarModel
Add documentation to ChartBarModel

creisterer-db/SwiftCharts,creisterer-db/SwiftCharts,i-schuetz/SwiftCharts,creister/SwiftCharts,RobotsAndPencils/SwiftCharts,grafiti-io/SwiftCharts,creister/SwiftCharts,i-schuetz/SwiftCharts,RobotsAndPencils/SwiftCharts,grafiti-io/SwiftCharts,i-schuetz/SwiftCharts,grafiti-io/SwiftCharts,creisterer-db/SwiftCharts,RobotsAndPencils/SwiftCharts,creister/SwiftCharts