Add a shared debug signature

app/build.gradle

@@ -43,6 +43,15 @@ android {
             excludes += '/META-INF/{AL2.0,LGPL2.1}'
         }
     }
+
+    signingConfigs {
+        debug {
+            keyAlias 'androiddebugkey'
+            keyPassword 'android'
+            storeFile file('./signature/debug.keystore')
+            storePassword 'android'
+        }
+    }
 }
 
 dependencies {