feat(C#): add Mandelbrot benchmark

c-sharp/.gitignore

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+**/*.exe

c-sharp/Makefile

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+SCRIPTS = $(wildcard **/*.cs)
+
+BINARIES =  $(SCRIPTS:%.cs=%-csc.exe) \
+			$(SCRIPTS:%.cs=%-mcs.exe)
+
+%-csc.exe: %.cs
+	mono-csc $< -out:$@
+
+%-mcs.exe: %.cs
+	mcs $< -out:$@
+
+all: $(BINARIES)
+
+.PHONY: clean
+
+clean:
+	rm -f $(BINARIES)

c-sharp/benchmark.yml

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+title: 'C#'
+
+strategy:
+  matrix:
+    command:
+      - title: 'csc'
+        command: 'mono %s-csc.exe'
+
+      - title: 'mcs'
+        command: 'mono %s-mcs.exe'
+
+    files:
+      - mandelbrot/Simple

c-sharp/mandelbrot/Simple.cs

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+using System;
+
+class Program
+{
+    static void Main()
+    {
+        var startTime = DateTime.Now;
+
+        Index();
+
+        var endTime = DateTime.Now;
+        var duration = endTime - startTime;
+        Console.WriteLine("Execution time: " + duration.TotalMilliseconds + "ms");
+    }
+
+    static void Index()
+    {
+        for (int y = -39; y < 39; y++)
+        {
+            Console.WriteLine();
+
+            for (int x = -39; x < 39; x++)
+            {
+                int i = Mandelbrot(x / 40.0, y / 40.0);
+
+                if (i == 0)
+                {
+                    Console.Write("*");
+                }
+                else
+                {
+                    Console.Write(" ");
+                }
+            }
+        }
+
+        Console.WriteLine();
+    }
+
+    static int Mandelbrot(double x, double y)
+    {
+        double cr = y - 0.5;
+        double ci = x;
+        double zi = 0.0;
+        double zr = 0.0;
+        int i = 0;
+
+        while (true)
+        {
+            i++;
+
+            double temp = zr * zi;
+
+            double zr2 = zr * zr;
+            double zi2 = zi * zi;
+
+            zr = zr2 - zi2 + cr;
+            zi = temp + temp + ci;
+
+            if (zi2 + zr2 > 16)
+            {
+                return i;
+            }
+
+            if (i > 5000)
+            {
+                return 0;
+            }
+        }
+    }
+}