Add section on contributing to bits-service
Add section on contributing to bits-service

[#165053789]

Signed-off-by: Tobias Zipfel <087edddb12ac44c92ffe5bde7e37fdd0c506a257@de.ibm.com>

cloudfoundry-incubator/bits-service,cloudfoundry-incubator/bits-service,cloudfoundry-incubator/bits-service,cloudfoundry-incubator/bits-service,cloudfoundry-incubator/bits-service