speedcalc: add README

Signed-off-by: Michael Adam <obnox@samba.org>

diff --git a/README.md b/README.md
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+# speedcalc
+
+A time / distance / speed calculator and converter.
+
+Copyright (C) Michael Adam (obnox@samba.org) 2005,2015
+
+License: GPLv3+
+
+```
+USAGE: speedcalc [-t <time>] [-d <dist>] [-s <speed>] [-p <num>] [-o <unit>] [-v] [-h]
+```