Add documentation

Author: jhart-r7

documentation/modules/auxiliary/scanner/rdp/rdp_scanner.md

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+## Vulnerable Application
+
+  Any system exposing the remote desktop protocol, RDP, typically on 3389/TCP.
+
+## Verification Steps
+
+  1. Do: ```use auxiliary/scanner/rdp/rdp_scanner```
+  2. Do: ```set [RHOSTS]```, replacing ```[RHOSTS]``` with a list of hosts to test for the presence of RDP
+  3. Do: ```run```
+  4. If the host is exposing an identifiable RDP instance, it will print the endpoint.
+
+## Options
+
+  There are three options currently supported that control what security protocols to
+  send in the RDP negotiation request, which can be helpful in identifying RDP
+  endpoints that might be locked down or configured differently:
+
+  **TLS** Set to true to request TLS security support
+  **CredSSP** Set to true to request CredSSP support
+  **EarlyUser** Set to true to request Early User Authorization Result PDU support
+
+## Scenarios
+
+  ```
+msf auxiliary(rdp_scanner) > run
+
+[+] 10.4.18.26:3389       - Identified RDP
+[+] 10.4.18.22:3389       - Identified RDP
+[+] 10.4.18.89:3389       - Identified RDP
+[+] 10.4.18.9:3389        - Identified RDP
+[+] 10.4.18.67:3389       - Identified RDP
+[+] 10.4.18.80:3389       - Identified RDP
+[+] 10.4.18.34:3389       - Identified RDP
+[+] 10.4.18.70:3389       - Identified RDP
+[+] 10.4.18.30:3389       - Identified RDP
+[+] 10.4.18.76:3389       - Identified RDP
+[+] 10.4.18.13:3389       - Identified RDP
+[+] 10.4.18.91:3389       - Identified RDP
+[+] 10.4.18.5:3389        - Identified RDP
+[+] 10.4.18.47:3389       - Identified RDP
+[+] 10.4.18.41:3389       - Identified RDP
+[+] 10.4.18.105:3389      - Identified RDP
+[*] Scanned  44 of 256 hosts (17% complete)
+[*] Scanned  55 of 256 hosts (21% complete)
+[+] 10.4.18.118:3389      - Identified RDP
+[+] 10.4.18.108:3389      - Identified RDP
+[+] 10.4.18.139:3389      - Identified RDP
+[*] Scanned  94 of 256 hosts (36% complete)
+[*] Scanned 110 of 256 hosts (42% complete)
+[+] 10.4.18.157:3389      - Identified RDP
+[+] 10.4.18.166:3389      - Identified RDP
+[+] 10.4.18.164:3389      - Identified RDP
+[+] 10.4.18.170:3389      - Identified RDP
+[+] 10.4.18.185:3389      - Identified RDP
+[+] 10.4.18.209:3389      - Identified RDP
+[+] 10.4.18.188:3389      - Identified RDP
+[*] Scanned 156 of 256 hosts (60% complete)
+[+] 10.4.18.237:3389      - Identified RDP
+[+] 10.4.18.225:3389      - Identified RDP
+[*] Scanned 186 of 256 hosts (72% complete)
+[*] Scanned 194 of 256 hosts (75% complete)
+[*] Scanned 208 of 256 hosts (81% complete)
+[*] Scanned 253 of 256 hosts (98% complete)
+[*] Scanned 256 of 256 hosts (100% complete)
+[*] Auxiliary module execution completed
+```