update readme

README.md

@@ -6,12 +6,21 @@
 A [Termux](https://termux.com) add-on app allowing Termux programs to be executed
 from [Tasker](https://tasker.dinglisch.net/).
 
-- [Termux:Task on Google Play](https://play.google.com/store/apps/details?id=com.termux.tasker)
-- [Termux:Task on F-Droid](https://f-droid.org/repository/browse/?fdid=com.termux.tasker)
+## Installation
 
-## License
+Termux:Task application can be obtained from:
 
-Released under [the GPLv3 license](https://www.gnu.org/licenses/gpl.html).
+- [Google Play](https://play.google.com/store/apps/details?id=com.termux.tasker)
+- [F-Droid](https://f-droid.org/en/packages/com.termux.tasker/)
+- [Kali Nethunter Store](https://store.nethunter.com/en/packages/com.termux.tasker/)
+
+Additionally we offer development builds for those who want to try out latest
+features ready to be included in future versions. Such build can be obtained
+directly from [Cirrus CI artifacts](https://api.cirrus-ci.com/v1/artifact/github/termux/termux-tasker/debug-build/output/app/build/outputs/apk/debug/app-debug.apk).
+
+Signature keys of all offered builds are different. Before you switch the
+installation source, you will have to uninstall the Termux application and
+all currently installed plugins.
 
 ## How to use
 
@@ -21,3 +30,7 @@ Released under [the GPLv3 license](https://www.gnu.org/licenses/gpl.html).
 4. Edit the configuration to specify the executable in `~/.termux/tasker/` to
    execute, and if it should be executed in the background (the default) or in a
    new terminal session.
+
+## License
+
+Released under [the GPLv3 license](https://www.gnu.org/licenses/gpl.html).