Implement fully-automated extraction from an offline Windows system

[depau]

Hi!

First of all thanks for the two videos about the topics in these scripts, nice work!

I wanted to see if it was possible to extract the required values directly off of an offline Windows installation. I found python-registry which implements reading the registry hives directly out of System32 if the user has read-only access to the required files.

I tested this on a Linux system by mounting the Windows drive to /mnt:

$ python3 -m sam.samreader --sys32-config /mnt/Windows/System32/config

LSA key:
🔑 0x...

Boot key:
🔐 0x...

[...]

This PR:

• Adds requirements.txt since it was missing
• Makes the samreader script runnable as a module entrypoint since running it directly causes import problems — I'm not sure how you were running it
• Implements loading all values (LSA key and SAM info) directly off of System32\config\{SAM,SYSTEM}, without going through the annoying PDF print process and registry export.

[Endermanch]

I'll merge that somewhere around next week. Thank you for cleaning up the code, I've been wanting to do that since the video dropped.