Adding documentation

Author: msutovsky-r7

documentation/modules/auxiliary/scanner/ivanti/login_scanner.md

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+## Description
+
+The module performs bruteforce attack against Ivanti Connect Secure.
+It allows to attack both regular user and admin as well - you can select which type of account to attack with `ADMIN` parameter. 
+
+## Vulnerable Application
+
+- [Ivanti](https://www.ivanti.com/products/connect-secure-vpn)
+
+## Verification Steps
+
+1. `use auxiliary/scanner/ivanti/login_scanner`
+2. `set RHOSTS [IP]`
+3. either `set USERNAME [username]` or `set USERPASS_FILE [usernames file]`
+4. either `set PASSWORD [password]` or `set PASS_FILE [passwords file]`
+5. `set ADMIN [attack admin?]`
+6. `run`
+
+