Create PieChart

[AppPear]

v2 ticket

Ticket description:

Create PieChart
In the new-version branch you can find barchart and linechart already implemented using that implement PieChart

• should be a type of ChartType: public struct PieChart: ChartType
• should display a basic piechart in the given frame

you can reuse the code you can find in the current version of the piechart

Should work like this:

ChartView(data: [0, 5, 6, 2, 13, 4, 3, 6])
.type(PieChart())

more info: #89