Pie-chart.md

-pir chart
+[Original mermaid js pie chart documentation](https://mermaid-js.github.io/mermaid/#/pie)
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+
+>A pie chart (or a circle chart) is a circular statistical graphic, which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area), is proportional to the quantity it represents. While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented. The earliest known pie chart is generally credited to William Playfair's Statistical Breviary of 1801 -Wikipedia
+
+To create a pie chart use `Create` method of `PieChart` class
+```c#
+var pie = PieChart.Create("Goods", showData: true);
+```
+
+## Adding values
+To add value simply call `Add` method
+```c#
+pie.Add("Some",  44);   // int
+pie.Add("Someq", 44.0); // double
+pie.Add("Somes", 44m);  // decimal
+pie.Add("Somse", 44f);  // float
+```
+
+## Generating syntax
+```c#
+string markdownSyntax = pie.Render();
+```
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