add Material Design Color Palette by @HozakaN

Author: Joker

categories/tools.md

@@ -7,6 +7,7 @@ App Name                   | Describe                  | Major Language
 [Flock](https://github.com/WhisperSystems/Flock) | Private contact and calendar sync for Android. https://whispersystems.org/blog/flock  | Java | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=org.anhonesteffort.flock)  
 [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 | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=eu.inmite.android.gridwichterle)  
 [OS Monitor](https://github.com/eolwral/OSMonitor) | Android OS Monitor  | Java | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=com.eolwral.osmonitor)  
+[Material Design Color Palette](https://github.com/HozakaN/MaterialDesignColorPalette) | This is a dev tool to visualize the colours of Material design defined on http://www.google.com/design/spec/style/color.html#color-ui-color-palette  | Java | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=fr.hozakan.materialdesigncolorpalette)  
 [Prey Anti Theft](https://github.com/prey/prey-android-client) | Android client for the Prey anti-theft software. http://preyproject.com  | Java | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=com.prey)  
 [Telecine](https://github.com/JakeWharton/Telecine) | Record full-resolution video on your Android devices. | Java | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=com.jakewharton.telecine)  
 [Terminal Emulator for Android](https://github.com/jackpal/Android-Terminal-Emulator) | A VT-100 terminal emulator for the Android OS | Java | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=jackpal.androidterm)