start working on convert tool

CMakeLists.txt

common/cpp/include/common/file_info.h

common/cpp/include/database/database.h

common/cpp/include/database/mongo_database.h

common/cpp/include/system_wrappers/io.h

common/cpp/include/system_wrappers/system_io.h

common/cpp/include/unittests/MockIO.h

common/cpp/src/system_io.cpp

common/cpp/src/system_io_linux.cpp

common/cpp/src/system_io_windows.cpp

tests/system_io/read_file_content/read_file_content.cpp

tests/system_io/read_files_in_folder/read_folder_content.cpp

worker/api/cpp/src/folder_data_broker.cpp

worker/api/cpp/unittests/test_folder_broker.cpp

worker/tools/CMakeLists.txt

worker/tools/folder_to_db/CMakeLists.txt

worker/tools/folder_to_db/src/FolderDBConverter.cpp

worker/tools/folder_to_db/src/FolderDBConverter.h

worker/tools/folder_to_db/unittests/test_folder_to_db.cpp