added readme

README

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+Unit conversion v0.1.0
+ by Avril <flanchan@cumallover.me> with <3 (license GPL3+)
+
+This program takes a value with a unit and outputs the smallest value corresponding to that type to `stdout`. It then outputs the multiplyer used to convert this unit to `stderr`, if there is one needed.
+
+usage: units <unit> <value>
+usage: units --help
+
+Units:
+ BYTES		Convert byte unit (k, m, g, p) into single bytes