Fix problems with project building

DEVSIX-6634

Author: introfog

android-pdf-viewer/build.gradle

@@ -38,6 +38,7 @@ android {
 }
 
 repositories {
+    mavenLocal()
     maven {
         url "https://repo.itextsupport.com/android"
     }

gradle.properties

@@ -0,0 +1,10 @@
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true