Add GitFox

Author: jpr0ger

categories/tools.md

@@ -60,6 +60,7 @@ App Name                   | Describe                  | Major Language
 App Name                   | Describe                  | Major Language             | Download
 :------------------------: | :------------------------ | :------------------------: | :------------------------:
 [GfyCat](https://github.com/dlew/android-gfycat) | Android application that loads gifs via gfycat for efficiency's sake  | Java | [![Get it on Third-Party](http://i.imgur.com/ppYJYe5.png)](https://github.com/dlew/android-gfycat/releases)  
+[GitFox](https://gitlab.com/terrakok/gitlab-client) | Client to manage GitLab projects. Clean Architecture implementation  | Kotlin | [![Get it on Google Play](http://i.imgur.com/7sq06lr.png)](https://play.google.com/store/apps/details?id=com.gitlab.terrakok.gitfox)  
 [GitHub Status](https://github.com/cdeange/github-status) | Simple app to connect to Github's status API  | Java |   
 [GridWichterle](https://github.com/inmite/android-grid-wichterle) | This app will show grid overlay over whole system which helps you to verify your excellent app design.  | Java |