addcomputer.py, impacket-addcomputer: add page (#19696)

Co-authored-by: Ivan Baluta <50071699+ivanbaluta@users.noreply.github.com>

pages/common/add-computer.py.md

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+# addcomputer.py
+
+> Add a computer account to domain.
+> More information: <https://github.com/fortra/impacket>.
+
+- Add a computer with a specific name and password:
+
+`addcomputer.py -computer-name {{COMPUTER_NAME$}} -computer-pass {{computer_password}} {{domain}}/{{username}}:{{password}}`
+
+- Only set a new password on an existing computer:
+
+`addcomputer.py -no-add -computer-name {{COMPUTER_NAME$}} -computer-pass {{computer_password}} {{domain}}/{{username}}:{{password}}`
+
+- Delete an existing computer account:
+
+`addcomputer.py -delete -computer-name {{COMPUTER_NAME$}} {{domain}}/{{username}}:{{password}}`
+
+- Add computer using Kerberos authentication:
+
+`addcomputer.py -k -no-pass {{domain}}/{{username}}@{{hostname}}`
+
+- Add computer via LDAPS (port 636) instead of SAMR (port 445):
+
+`addcomputer.py -method LDAPS -port 636 {{domain}}/{{username}}:{{password}}`
+
+- Specify exact domain controller when multiple DCs exist:
+
+`addcomputer.py -dc-host {{hostname}} {{domain}}/{{username}}:{{password}}`

pages/common/impacket-addcomputer.md

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+# impacket-addcomputer
+
+> This command is an alias of `addcomputer.py`.
+
+- View documentation for the original command:
+
+`tldr addcomputer.py`