Added Criterion unit test framework

tests/src/rse_math_tests.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+#include "criterion/criterion.h"
+
+Test(sampe, test)
+{
+    cr_expect(strlen("Tests") == 4, "Expected \"Test\" to have lenght of 4");
+}