Build status and example in README

README.md

@@ -1,3 +1,27 @@
 `overround-methods`
 ===
-A collection of overround application methods.
+[![Build Status](https://img.shields.io/github/actions/workflow/status/kindredgroup/overround-methods/master.yml?branch=master&style=flat-square&logo=github)](https://github.com/kindredgroup/overround-methods/actions/workflows/dotnet.yml)
+
+A collection of overround application methods.
+
+# Examples
+```csharp
+using Overround;
+
+double[] fairPrices = [1 / 0.1, 1 / 0.2, 1 / 0.3, 1 / 0.4];
+double fairBooksum = Booksum.FromPrices(fairPrices);
+Console.WriteLine("fair prices:     [{0}]", string.Join(", ", fairPrices));
+Console.WriteLine("fair booksum:    {0}", fairBooksum);
+
+double idealOverround = 1.15;
+Console.WriteLine("ideal overround: {0}", idealOverround);
+
+IOverroundMethod[] methods = [new Multiplicative(), new Additive(), new Power(), new OddsRatio()];
+foreach (var method in methods)
+{
+    double[] odds = method.Apply(fairPrices, idealOverround);
+    Console.WriteLine("");
+    Console.WriteLine("method:          {0}", method.GetType().Name);
+    Console.WriteLine("odds:            [{0}]", string.Join(", ", odds));
+}
+```