Update readme

README.md

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 # Todo.txt for Android [![](https://img.shields.io/gitter/room/todotxt/todo.txt-android.svg)](https://gitter.im/todotxt/todo.txt-android)
 
+
+The official Todo.txt Android application is not available anymore. It had stopped working after Dropbox updated their SDK.
+
+There are a number of community-developed apps available for Todo.txt on Android. The full, updated list of community developed apps is under '`Community Apps > Mobile`' on the [home page](http://todotxt.org/#communityMobile).
+
+#### Other Todo.txt compatible apps for Android:
+
+- [Simpletask](https://play.google.com/store/apps/details?id=nl.mpcjanssen.todotxtholo)  
+  Powerful todo.txt app for Android, by [Mark Janssen](https://mpcjanssen.nl/). Also available in a [cloudless](https://play.google.com/store/apps/details?id=nl.mpcjanssen.simpletask) version.</p>
+
+- [Todo.txt for Android](https://play.google.com/store/apps/details?id=net.c306.ttsuper&referrer=utm_source%3Dtodotxt_website%26utm_medium%3Dcommunity_apps)  
+  Fast, powerful, modern UI; syncs with Dropbox, Google Drive and local files (cloudless).  Supports 6.0 Marshmallow or higher. Offered by [Aditya Bhaskar](https://c306.net).</p>
+
+- [Markor](https://github.com/gsantner/markor)  
+  Lightweight Android app - Notes, ToDo &amp; Bookmarks. Supports Markdown &amp; todo.txt, by [Gregor Santner](https://gsantner.net/?source=todotxt&project=markor).</p>
+
+- [Mindstream](https://github.com/xuhcc/mindstream)  
+  Simple mobile todo.txt app. Also available as self-hosted web app.</p>
+
+<!--
 The official Todo.txt Android application by [Gina Trapani](http://ginatrapani.org) and [the Todo.txt community](http://groups.yahoo.com/group/todotxt/) designed to manage your [todo.txt file](http://todotxt.com) stored in [Dropbox](http://dropbox.com).
 
 [Purchase Todo.txt on Google Play](https://play.google.com/store/apps/details?id=com.todotxt.todotxttouch), the [Amazon Appstore](http://www.amazon.com/o/ASIN/B004MNQTVU/ref=nosim/lifehackerboo-20), or download and compile the source code. This app is in active development and there are several [known bugs and todo items](https://github.com/ginatrapani/todo.txt-android/issues). 
@@ -9,3 +29,4 @@ Using Todo.txt for Android requires a [Dropbox](http://dropbox.com) account in o
 There are multitudes of todo list managers for Android. Todo.txt is a minimalist, plain-text focused solution we built to learn by collaborating on Android development. 
 
 Interested in joining in? Fork the project and talk to us on the [Todo.txt mailing list](http://groups.yahoo.com/group/todotxt/).
+-->