Added documentation about adding to project

Update versions for more modern OS versions

Added primary/secondary fill for centered bar

Added primary/secondary fill demo

Push primary/secondary fill through to line/stack UIKit view and SwiftUI

Update swift.yml

Create swift.yml

Fixed centered graph gradient fill

Updated doco

Fixed cocoapods build

Update for cocoapods

Added animation object to DSFSparkline namespace

Removed all IBDesignable/IBInspectable (Xcode dropping support)

Updating docs

Better handling for animation