Update README.md

Author: ShubhamJagtap2000

13 - Meterpreter Post Exploitation/04 - Hashdump/README.md

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+# Hashdump
 
+- The `hashdump` command will list the content of the ***SAM database***. 
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+- The `SAM` (Security Account Manager) database stores user's passwords on Windows systems. 
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+- These passwords are stored in the `NTLM` (New Technology LAN Manager) format.
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+  ![image](https://user-images.githubusercontent.com/63872951/187254745-1ac2c6b0-0741-4884-b669-3c0150aec3ed.png)
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+- While it is `not` mathematically possible to "crack" these hashes, you may still discover the cleartext password using online NTLM databases or a rainbow table attack. 
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+- These hashes can also be used in `Pass-the-Hash` attacks to authenticate to other systems that these users can access the same network.