mssqlclient.py, impacket-mssqlclient: add page (#15908)

pages/common/impacket-mssqlclient.md

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+# impacket-mssqlclient
+
+> This command is an alias of `mssqlclient.py`.
+> Part of the Impacket suite.
+> More information: <https://github.com/fortra/impacket>.
+
+- View documentation for the original command:
+
+`tldr mssqlclient.py`

pages/common/mssqlclient.py.md

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+# mssqlclient.py
+
+> Connect to Microsoft SQL Server instances and execute queries.
+> Part of the Impacket suite.
+> More information: <https://github.com/fortra/impacket>.
+
+- Connect to an MSSQL server using Windows authentication:
+
+`mssqlclient.py -windows-auth {{domain}}/{{username}}:{{password}}@{{target}}`
+
+- Connect using SQL server authentication:
+
+`mssqlclient.py {{username}}:{{password}}@{{target}}`
+
+- Connect using pass-the-hash authentication:
+
+`mssqlclient.py {{domain}}/{{username}}@{{target}} -hashes {{LM_Hash}}:{{NT_Hash}}`
+
+- Connect using Kerberos authentication (requires valid tickets):
+
+`mssqlclient.py -k {{domain}}/{{username}}@{{target}}`
+
+- Execute a specific SQL command upon connection:
+
+`mssqlclient.py {{username}}:{{password}}@{{target}} -query "{{SELECT user_name();}}"`
+
+- Execute multiple SQL commands from a file:
+
+`mssqlclient.py {{username}}:{{password}}@{{target}} -file {{path/to/sql_file.sql}}`
+
+- Connect to a specific database instance (default is `None`):
+
+`mssqlclient.py {{username}}:{{password}}@{{target}} -db {{database_name}}`
+
+- Display SQL queries before execution:
+
+`mssqlclient.py {{username}}:{{password}}@{{target}} -show`