add DesignOverlay

Author: Joker

README.md

@@ -117,6 +117,7 @@ App Name                   | Describe                  | Major Language
 App Name                   | Describe                  | Major Language             | Download 
 :------------------------: | :------------------------ | :------------------------: | :------------------------: 
 [Bitocle for GitHub](https://github.com/mthli/Bitocle) | Bitocle is a simple android app which allows you to view your source code in GitHub.  | 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=io.github.mthli.Bitocle)  
+[DesignOverlay](https://github.com/Manabu-GT/DesignOverlay-Android) | Android app which displays design image with grid lines to facilitate the tedious design implementation process  | 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.ms_square.android.design.overlay)  
 [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)  
 [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)  
 [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)