jackson deps added

mobile/build.gradle

@@ -25,6 +25,10 @@ dependencies {
 
     implementation project(':common')
 
+    implementation 'com.fasterxml.jackson.core:jackson-core:2.9.6'
+    implementation 'com.fasterxml.jackson.core:jackson-annotations:2.9.6'
+    implementation 'com.fasterxml.jackson.core:jackson-databind:2.9.6'
+
     // jUnit
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'