[patience.c]: Add patience.c

patience.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int main() {
+    char* flag = "Flag: d3c0mp1l3";
+
+    printf("The flag will be printed in 1 year's time, please wait...\n");
+
+    sleep(31536000);
+    printf("%s", flag);
+}