Add script to export JSON for ATT&CK Navigator

The source of `CompareSysmonTo-MITRE_ATTCK.ps1` script is
from olafhartong#80

Thanks to the lead author, nicpenning, for his/her contribution.
This script is useful and cool!

Finally, modify some code in the script according to my needs, such
as loading MITRE ATT&CK v11.0

Author: stavhaygn