Creates a directory in the Files folder (depending on the common_flag value)
[in] Name of the directory to be created. Contains the relative path to the folder.
[in] Flag defining the directory location. If common_flag=FILE_COMMON, the directory is located in the common folder of all client terminals \Terminal\Common\Files. Otherwise, the directory is in the local folder (MQL5\Files or MQL5\Tester\Files when testing).
Returns true if successful, otherwise false.
For reasons of security, working with files is strictly controlled in MQL5 language. Files used in file operations by means of MQL5 language cannot be located outside the file sandbox.