nstall check_mk plugin on veeam server

copy veeam_backup_key.ps1 to "C:\ProgramData\checkmk\agent\plugins"

Features

Read data veeam via custom plugin
Read actual keys creating date
Can be manage warning or critical time for editing keys
Open source code you can modify if you need
support only check_mk 2 or higher
supported and developed on veeam 11