Begin to add mock siad for testing

UnitTests/MockSiad.h

@@ -0,0 +1,22 @@
+#pragma once
+#include <SiaApi.h>
+
+using namespace Sia::Api;
+
+class CMockSiad
+{
+public:
+	CMockSiad(const SiaHostConfig& hostConfig);
+
+	~CMockSiad();
+
+private:
+	SiaHostConfig _hostConfig;
+	HANDLE _stopEvent;
+	std::unique_ptr<std::thread> _serverThread;
+
+public:
+	void Start();
+	void Stop();
+};
+