Initial commit of .NET port of FlatBuffers

Include C# codegen in flatc and .NET FlatBuffer access via the
FlatBufferBuilder class

Tested: on Windows.

Change-Id: If5228a8df60a10e0751b245c6c64530264ea2d8a

tests/FlatBuffers.Test/Assert.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FlatBuffers.Test
+{
+
+    public class AssertFailedException : Exception
+    {
+        private readonly object _expected;
+        private readonly object _actual;
+
+        public AssertFailedException(object expected, object actual)
+        {
+            _expected = expected;
+            _actual = actual;
+        }
+
+        public override string Message
+        {
+            get { return string.Format("Expected {0} but saw {1}", _expected, _actual); }
+        }
+    }
+
+    public class AssertUnexpectedThrowException : Exception
+    {
+        private readonly object _expected;
+
+        public AssertUnexpectedThrowException(object expected)
+        {
+            _expected = expected;
+        }
+
+        public override string Message
+        {
+            get { return string.Format("Expected exception of type {0}", _expected); }
+        }
+    }
+
+    public static class Assert
+    {
+        public static void AreEqual<T>(T expected, T actual)
+        {
+            if (!expected.Equals(actual))
+            {
+                throw new AssertFailedException(expected, actual);
+            }
+        }
+
+        public static void IsTrue(bool value)
+        {
+            if (!value)
+            {
+                throw new AssertFailedException(true, value);
+            }
+        }
+
+        public static void Throws<T>(Action action) where T : Exception
+        {
+            var caught = false;
+            try
+            {
+                action();
+            }
+            catch (T ex)
+            {
+                caught = true;
+            }
+
+            if (!caught)
+            {
+                throw new AssertUnexpectedThrowException(typeof (T));
+            }
+        }
+    }
+}