add Dokka for documentation

@@ -3,6 +3,7 @@
 buildscript {
     ext.kotlin_version = '1.4.31'
     ext.java_version = JavaVersion.VERSION_1_8
+    ext.dokka_version = '1.4.30'
     repositories {
         google()
         mavenCentral()
@@ -19,6 +20,10 @@ buildscript {
     }
 }
 
+plugins {
+    id "org.jetbrains.dokka" version "$dokka_version"
+}
+
 allprojects {
     repositories {
         google()

@@ -3,6 +3,9 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-kapt'
 apply plugin: 'kotlinx-serialization'
 apply plugin: 'com.google.protobuf'
+apply plugin: 'org.jetbrains.dokka'
+
+import java.net.URL
 
 android {
     compileSdkVersion 29
@@ -55,6 +58,27 @@ protobuf {
     }
 }
 
+dokkaHtml {
+    moduleName.set("livekit-android-sdk")
+    dokkaSourceSets {
+        configureEach {
+            skipEmptyPackages.set(true)
+            includeNonPublic.set(false)
+            includes.from("module.md")
+
+            sourceLink {
+                localDirectory.set(file("src/main/java"))
+
+                // URL showing where the source code can be accessed through the web browser
+                remoteUrl.set(new URL(
+                    "https://github.com/livekit/client-sdk-android/tree/master/livekit-android-sdk/src/main/java"))
+                // Suffix which is used to append the line number to the URL. Use #L for GitHub
+                remoteLineSuffix.set("#L")
+            }
+        }
+    }
+}
+
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
@@ -74,4 +98,4 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
-}
\ No newline at end of file
+}

+# Module livekit-android-sdk
+
+Android Client SDK to [LiveKit](https://github.com/livekit/livekit-server).
+
+# Package io.livekit.android
+
+This package contains the initial `connect` function.
+
+# Package io.livekit.android.room
+
+Room is the primary class that manages the connection to the LiveKit Room. It exposes listeners that lets you hook into room events

+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        jcenter()
+    }
+}
 include ':sample-app', ':livekit-android-sdk'
 rootProject.name='livekit-android'