Emulator+Test: Add main and example unit test

src/main.cpp

@@ -0,0 +1,12 @@
+#include <cstdio>
+
+#include "ruc/timer.h"
+
+int main(int argc, char* argv[])
+{
+	ruc::Timer t;
+
+	printf("%fms\n", t.elapsedNanoseconds() / 1000000.0);
+
+	return 0;
+}