modified gradle files to add a documentation generation system

build.gradle

@@ -1,6 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext.kotlin_version = "1.4.0"
+    ext.dokka_version = "1.4.0"
     repositories {
         google()
         jcenter()
@@ -8,6 +9,7 @@ buildscript {
     dependencies {
         classpath "com.android.tools.build:gradle:4.0.1"
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

settings.gradle

@@ -1,2 +1,9 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        jcenter()
+    }
+}
+
 rootProject.name = "ConversionApp"
 include ':app'