updated readme

jpohjolainen · Jun 4, 2015 · 5707871 · 5707871
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 # calc-date
+
+```shell
+usage: ./calc-date <date> +-<delta>|<date>
+
+date    iso8601 format, e.g. 2015-06-01T09:45:53
+delta   time to count from date. Select operation with + or - followed
+        by any combination of:
+        <n>d for days,
+        <n>h for hours,
+        <n>m for minutes
+        <n>s for seconds.
+```