WIP: error messages

.gitlab-ci.yml

CMakeLists.txt

DEPENDENCIES.md

README_SETUP.md

caosdb-client-configuration-schema.json

include/CMakeLists.txt

include/caosdb/configuration.h

include/caosdb/connection.h

include/caosdb/entity.h

include/caosdb/exceptions.h

include/caosdb/info.h

include/caosdb/log_level.h

include/caosdb/logging.h

include/caosdb/message_code.h

include/caosdb/status_code.h

include/caosdb/transaction.h

include/caosdb/transaction_status.h

include/ccaosdb.h

proto

src/CMakeLists.txt