Add Vssadmin.exe - #520
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This loosk great TY @mmadersbacher
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Adds Vssadmin.exe, requested in Backlog.txt.
vssadmin delete shadows /all /quiet deletes all volume shadow copies on the
host, a Tamper technique (T1490, Inhibit System Recovery) commonly used by
ransomware to block file and system recovery.
The binary is Microsoft-signed and ships in C:\Windows\System32 on Windows
10/11 and Server. Detection references the SigmaHQ rule for shadow copy
deletion, which explicitly covers vssadmin.exe.
Validated locally: python .github/workflows/validation.py and
yamllint -c .github/.yamllint both pass for the new file.