add: basic usage example

example_request.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env sh
+
+while true; do curl --location --request \
+POST 'http://localhost:7878/upload' \
+--form 'file=@/home/.q1/Pictures/Screenshot_20200513_104645.png' \
+-w ' Total: %{time_total}' && printf '\n'; done;