Added redirect.c sample

samples/redirect.c

@@ -0,0 +1,15 @@
+#include <criterion/criterion.h>
+#include <criterion/redirect.h>
+
+#include <stdio.h>
+
+Test(redirect, stdout) {
+    cr_redirect_stdout();
+
+    fprintf(stdout, "foo");
+    fflush(stdout);
+
+    FILE* stdout_in = cr_get_redirected_stdout();
+
+    cr_assert_file_contents_match_str(stdout_in, "foo");
+}