rename unit test files

cpp/test_glicko2.cpp

@@ -0,0 +1,25 @@
+#include "glicko2.h"
+
+#include <cstdio>
+
+int main()
+{
+	// Glicko-2 Example
+	// calculation from http://www.glicko.com/glicko2.doc/example.html
+
+	Glicko2 A(1500.0, 200.0, 0.06);
+	Glicko2 B(1400.0,  30.0, 0.06);
+	Glicko2 C(1550.0, 100.0, 0.06);
+	Glicko2 D(1700.0, 300.0, 0.06);
+
+	A.AddWin(B);
+	A.AddLoss(C);
+	A.AddResult(D,Glicko2::LOSS); // alternative way to add a result
+
+	A.Update();
+
+	printf("rating = %f, RD = %f\n", A.GetRating(), A.GetDeviation());
+
+	return 0;
+}
+