Add C# implementaion of 86 Target

86 Target/csharp/Target/FiringRange.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace Target
+{
+    internal class FiringRange
+    {
+        private readonly Random random;
+
+        public FiringRange()
+        {
+            random = new Random();
+            NextTarget();
+        }
+
+        public Point TargetPosition { get; private set; }
+
+        public void NextTarget() =>  TargetPosition = random.NextPosition();
+
+        public Explosion Fire(Angle angleFromX, Angle angleFromZ, float distance)
+        {
+            var explosionPosition = new Point(angleFromX, angleFromZ, distance);
+            var targetOffset = explosionPosition - TargetPosition;
+            return new (explosionPosition, targetOffset);
+        }
+    }
+}