added first version of git workflow
added first version of git workflow

Signed-off-by: Andreas Pieber <57efbcbb22ec0bd89955a40df26b44c340d3e38d@gmail.com>

openengsb/openengsb,openengsb/openengsb,tobster/openengsb,openengsb/openengsb,tobster/openengsb,openengsb/openengsb,openengsb/openengsb,tobster/openengsb,tobster/openengsb,openengsb/openengsb