Add PGP key FAQ entry.

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+---
+layout: post
+title:  "How do I verify TWRP files with PGP?"
+---
+
+Recently we implemented signing TWRP files with OpenPGP for security minded people who want to verify
+the repudiation of twrp.me files. You can read more about OpenPGP <a href="http://openpgp.org/about/">here</a>
+
+To verify a file, you will need to install our <a href="https://dl.twrp.me/public.asc">public key</a> into
+your keyring. The public key is also listed on each device's download page. Please download the key to a new file.
+When you click on the page, you will see a link for the PGP verification file as
+"Download PGP Signature twrp-device-version.type.asc. This file is in binary format and is created using our
+private key the first time the download page is created for the file. You can then perform
+the following steps to verify repudiation (Linux steps only):
+
+<ol>
+<li><pre>gpg --import twrp-public.asc</pre></li>
+<li><pre>gpg --verify twrp-device-version.type.asc twrp-device-version.type</pre></li>
+</ol>
+
+For Windows, please find a OpenPGP implementation and read the documentation to perform these steps.