Create VERIFY_ISO.md

VERIFY_ISO.md

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+### 2.0.0-rc1 ISO image built on 2020/07/20
+
+### Download and Verify
+
+2.0.0-rc1 ISO image:  
+https://download.securityonion.net/file/securityonion/securityonion-2.0.0-rc1.iso
+
+MD5: 788570E839439C23956581C6145B8689  
+SHA1: A87CAF016C989D4DB4D4ED619DF072B708BA28FE  
+SHA256: C5AC6419AF40CB98E93C53CE4101E7DE5F51AEE76DB46734191D783503649210  
+
+Signature for ISO image:  
+https://github.com/Security-Onion-Solutions/securityonion/raw/master/sigs/securityonion-2.0.0-rc1.iso.sig
+
+Signing key:  
+https://raw.githubusercontent.com/Security-Onion-Solutions/securityonion/master/KEYS  
+
+For example, here are the steps you can use on most Linux distributions to download and verify our Security Onion ISO image.
+
+Download and import the signing key:  
+```
+wget https://raw.githubusercontent.com/Security-Onion-Solutions/securityonion/master/KEYS -O - | gpg --import -  
+```
+
+Download the signature file for the ISO:  
+```
+https://github.com/Security-Onion-Solutions/securityonion/raw/master/sigs/securityonion-2.0.0-rc1.iso.sig
+```
+
+Download the ISO image:  
+```
+wget https://download.securityonion.net/file/securityonion/securityonion-2.0.0-rc1.iso
+```
+
+Verify the downloaded ISO image using the signature file:  
+```
+gpg --verify securityonion-2.0.0-rc1.iso.sig securityonion-2.0.0-rc1.iso
+```
+
+The output should show "Good signature" and the Primary key fingerprint should match what's shown below:
+```
+gpg: Signature made Mon 20 Jul 2020 03:01:19 PM EDT using RSA key ID FE507013
+gpg: Good signature from "Security Onion Solutions, LLC <info@securityonionsolutions.com>"
+gpg: WARNING: This key is not certified with a trusted signature!
+gpg:          There is no indication that the signature belongs to the owner.
+Primary key fingerprint: C804 A93D 36BE 0C73 3EA1  9644 7C10 60B7 FE50 7013
+```
+
+Once you've verified the ISO image, you're ready to proceed to our Installation guide:  
+https://docs.securityonion.net/en/2.0/installation.html