Add package for open2300

Open2300 is a package of software tools that reads (and writes) data
from a Lacrosse WS2300/WS2305/WS2310/WS2315 Weather Station.

This package will install all the binaries on the target.

Signed-off-by: Alexandre Belloni <alexandre.belloni@piout.net>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>