Add module docs for the ldap server module

documentation/modules/auxiliary/server/ldap.md

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+## Vulnerable Application
+This module demonstrates setting up and running a basic LDAP server in Metasploit. The data it hosts is provided by the
+`LDIF_FILE`.
+
+## Verification Steps
+
+1. Start msfconsole
+1. Do: `use auxiliary/server/ldap`
+1. Do: `set LDIF_FILE data/exploits/ldap/msf.ldif`
+    * This assumes the working directory is the top-level Metasploit Framework directory and configures the module to
+      use the included template.
+1. Do: `run`
+1. From a new shell, do: `ldapsearch -x -H ldap://192.168.159.128 -b "dc=metasploit,dc=com" "(objectClass=*)"`
+    * This runs a query using the `ldapsearch` utility to show the server is responsive. 
+
+## Options
+
+### LDIF_FILE
+
+Directory LDIF file path.
+
+## Scenarios
+
+### Metasploit Server Demonstration
+
+```
+msf6 > use auxiliary/server/ldap
+msf6 auxiliary(server/ldap) > set LDIF_FILE data/exploits/ldap/msf.ldif
+LDIF_FILE => data/exploits/ldap/msf.ldif
+msf6 auxiliary(server/ldap) > show options 
+
+Module options (auxiliary/server/ldap):
+
+   Name       Current Setting              Required  Description
+   ----       ---------------              --------  -----------
+   LDIF_FILE  data/exploits/ldap/msf.ldif  no        Directory LDIF file path
+   SRVHOST    0.0.0.0                      yes       The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
+   SRVPORT    389                          yes       The local port to listen on.
+
+
+Auxiliary action:
+
+   Name     Description
+   ----     -----------
+   Service  Run LDAP server
+
+
+msf6 auxiliary(server/ldap) > run
+[*] Auxiliary module running as background job 0.
+msf6 auxiliary(server/ldap) > 
+
+
+```
+
+From another shell:
+
+```
+$ ldapsearch -x -H ldap://192.168.159.128 -b "dc=metasploit,dc=com" "(objectClass=*)"
+# extended LDIF
+#
+# LDAPv3
+# base <dc=metasploit,dc=com> with scope subtree
+# filter: (objectClass=*)
+# requesting: ALL
+#
+
+# metasploit.com
+dn: dc=metasploit,dc=com
+objectClass: dcObject
+objectClass: organization
+o: Metasploit Framework
+dc: metasploit
+
+# search result
+search: 2
+result: 0 Success
+text: Success
+
+# numResponses: 2
+# numEntries: 1
+
+```