Created Nessus Integration (markdown)

Nessus-Integration.md

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+### Requirements
+This add-on requires a [Sn1per Professional v8.0](https://xerosecurity.com) license along with the following add-ons and components:
+- Command Execution Add-on
+- Nessus Add-on
+- Nessus v8.11.x
+
+This assumes that you already have a working Nessus installation running the latest version (8.11.x). If not, you can obtain a free Nessus license from https://www.tenable.com/downloads/nessus?loginAttempted=true
+
+### Installation
+After Nessus is installed, follow the steps below to install the Nessus add-on:
+
+1. Run ```/etc/init.d/nessusd start``` to start the Nessus service
+2. Open a new browser window and go to: https://127.0.0.1:8834/#/ and login to confirm your Nessus installation
+3. Extract contents of nessus-add-on.tar.gz to /tmp/
+```
+cd tmp
+tar -zxvf nessus-add-on.tar.gz
+```
+4. Run install-nessus-add-on.sh script as 'root':
+```
+sudo bash install-nessus-add-on.sh
+```
+
+### Configuration
+5. Add your Nessus host/IP, username and password to your /root/.sniper.conf file and set NESSUS="1" value to enable Nessus scanning in Sn1per
+```
+# NESSUS CONFIG
+NESSUS="1"
+NESSUS_HOST="127.0.0.1:8834"
+NESSUS_USERNAME="admin"
+NESSUS_PASSWORD=""
+NESSUS_POLICY_ID="c3cbcd46-329f-a9ed-1077-554f8c2af33d0d44f09d736969bf" #DEFAULT POLICY
+```
+
+### Running scans
+6. Run a test vuln scan to confirm your installation:
+```
+sniper -t 127.0.0.1 -m vulnscan -w 127.0.0.1
+```
+For multi-host scans, you can also use ```sniper -f targets.txt -m massvulnscan -w targets``` command.
+
+### Reporting
+After the scan(s) complete, results will be shown in the workspace report view under the "Vulnerabilities" section and from the host report.
+