Add README

Author: kubo39

gettimeofday/README.md

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+# gettimeofday example
+
+See [networking with qemu section](https://docs.zephyrproject.org/latest/connectivity/networking/qemu_setup.html#networking-with-qemu) too.
+
+creating helper socket.
+
+```console
+./loop-socat.sh
+```