Initial

FastRng/Double/Distributions/ChiSquare.cs

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+using System.Threading;
+using System.Threading.Tasks;
+
+namespace FastRng.Double.Distributions
+{
+    public sealed class ChiSquare : IDistribution
+    {
+        public IRandom Random { get; set; }
+
+        public double DegreesOfFreedom { get; set; } = 1.0;
+        
+        public async ValueTask<double> GetDistributedValue(CancellationToken token)
+        {
+            if (this.Random == null)
+                return 0.0;
+
+            return await this.Random.NextNumber(new Gamma{ Shape = 0.5 * this.DegreesOfFreedom, Scale = 2.0 }, token);
+        }
+    }
+}