Add clients

_includes/legacy/sections/email-providers.html

@@ -235,6 +235,7 @@ <h5>{% include badge.html color="warning" text=".onion Service" %}</h5>
     <h5>{% include badge.html color="info" text="Extra Functionality" %}</h5>
     <p>CTemplar has a <a href="https://ctemplar.com/help/answer/setting-up-a-dead-mans-timer/">dead man timer</a> feature that will automatically send a particular message after a given period of time.</p>
     <p>CTemplar also has a feature that allows users verify <a href="https://ctemplar.com/ctemplar-checksum-implementation/">checksums</a> of production pages with a public copy on Github.</p>
+    <p>Electron clients exist for Windows, Mac and Linux. There are mobile clients for iOS and Android <a href="https://f-droid.org/en/packages/com.ctemplar.app.fdroid">including F-Droid</a> These clients are <a href="https://github.com/orgs/CTemplar/repositories">open source</a>.</p>
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 </div>