Safeslinger: icon, about info

OpenKeychain/src/main/res/raw/help_about.html

@@ -26,6 +26,7 @@ And don't add newlines before or after p tags because of transifex -->
 <li>Nikhil Peter Raj</li>
 <li>Paul Sarbinowski</li>
 <li>'Senecaso'</li>
+<li>Signe Rüsch</li>
 <li>Sreeram Boyapati</li>
 <li>Thialfihar (APG 1.x)</li>
 <li>Tim Bray</li>
@@ -44,6 +45,7 @@ And don't add newlines before or after p tags because of transifex -->
 <li><a href="http://code.google.com/p/zxing/">ZXing</a> (Apache License v2)</li>
 <li><a href="http://rtyley.github.com/spongycastle/">SpongyCastle</a> (MIT X11 License)</li>
 <li><a href="https://github.com/dschuermann/html-textview">HtmlTextView</a> (Apache License v2)</li>
+<li><a href="https://github.com/SafeSlingerProject/exchange-android">SafeSlinger Exchange library</a> (MIT License)</li>
 </ul>
 </body>
 </html>