Enable gradle cache

Should improve build time.

gradle.properties

@@ -7,6 +7,9 @@
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
 org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# Enable gradle cache
+# https://docs.gradle.org/current/userguide/configuration_cache.html
+org.gradle.configuration-cache=true
 # 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
@@ -23,3 +26,4 @@ kotlin.code.style=official
 android.nonTransitiveRClass=true
 android.nonFinalResIds=false
 android.defaults.buildfeatures.buildconfig = true
+org.gradle.unsafe.configuration-cache=true