add key

android/app/build.gradle

@@ -97,12 +97,22 @@ android {
         applicationId "xyz.mtfos.buywhat"
         minSdkVersion 16
         targetSdkVersion 22
-        versionCode 1
+        versionCode 2
         versionName "1.0"
         ndk {
             abiFilters "armeabi-v7a", "x86"
         }
     }
+
+    signingConfigs {
+        release {
+            storeFile file("${rootDir}/mtfos")
+            storePassword "pass.ok=1"
+            keyAlias "mtfos"
+            keyPassword "pass.ok=1"
+        }
+    }
+
     splits {
         abi {
             reset()
@@ -115,6 +125,7 @@ android {
         release {
             minifyEnabled enableProguardInReleaseBuilds
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
+            signingConfig signingConfigs.release
         }
     }
     // applicationVariants are e.g. debug, release