Add Swift Package Manager support.
Add Swift Package Manager support.

jum/Charts,MAARK/Charts,icecrystal23/ios-charts,danielgindi/ios-charts,danielgindi/Charts,FreddyZeng/Charts,icecrystal23/ios-charts,MAARK/Charts,danielgindi/Charts,MAARK/Charts,liuxuan30/ios-charts,jum/Charts,danielgindi/Charts,danielgindi/ios-charts,jjatie/Charts,icecrystal23/ios-charts,jjatie/Charts,icecrystal23/ios-charts,danielgindi/ios-charts,liuxuan30/Charts,FreddyZeng/Charts,MAARK/Charts,danielgindi/ios-charts,liuxuan30/ios-charts,FreddyZeng/Charts,liuxuan30/Charts,jum/Charts,jum/Charts,jjatie/Charts,liuxuan30/Charts,FreddyZeng/Charts,jjatie/Charts,liuxuan30/Charts,liuxuan30/ios-charts,danielgindi/Charts,liuxuan30/ios-charts