timespect_get: move from cpp-cheat

README.adoc

@@ -17107,6 +17107,10 @@ Good sanity check for user mode: <<qemu-user-mode-getting-started>>
 *** File IO
 **** link:userland/c/file_write_read.c[]
 **** link:userland/linux/open_o_tmpfile.c[]: https://stackoverflow.com/questions/4508998/what-is-an-anonymous-inode-in-linux/44388030#44388030
+** `time.h`
+*** link:userland/c/timespec_get.c[] `timespec_get` is a C11 for `clock_gettime` http://stackoverflow.com/questions/361363/how-to-measure-time-in-milliseconds-using-ansi-c/36095407#36095407
++
+Vs `clock()`: http://stackoverflow.com/questions/12392278/measure-time-in-linux-getrusage-vs-clock-gettime-vs-clock-vs-gettimeofday
 * Fun
 ** link:userland/c/loop.c[]