added required files to publish

library/build.gradle

@@ -1,5 +1,17 @@
+buildscript {
+    repositories {
+        jcenter()
+        mavenLocal()
+    }
+}
+
+plugins {
+    id 'com.jfrog.bintray' version '1.6'
+}
+
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
+apply plugin: 'maven-publish'
 
 android {
     compileSdkVersion 24
@@ -30,3 +42,5 @@ dependencies {
 repositories {
     mavenCentral()
 }
+
+//apply from: 'publish.gradle'

library/publish.gradle

@@ -0,0 +1,66 @@
+
+group "$ext_groupId"
+version "$ext_version"
+
+publishing {
+  publications {
+    MyPublication(MavenPublication) {
+      from components.java
+      artifact sourcesJar
+      groupId "$ext_groupId"
+      artifactId "$ext_artifactId"
+      version "$ext_version"
+    }
+  }
+}
+
+task sourcesJar(type: Jar) {
+    from android.sourceSets.main.java.srcDirs
+    classifier = 'sources'
+}
+
+task javadoc(type: Javadoc) {
+    failOnError  false
+    source = android.sourceSets.main.java.sourceFiles
+    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
+    classpath += configurations.compile
+}
+
+// build a jar with javadoc
+task javadocJar(type: Jar, dependsOn: javadoc) {
+    classifier = 'javadoc'
+    from javadoc.destinationDir
+}
+
+artifacts {
+    archives javadocJar
+    archives sourcesJar
+}
+
+bintray {
+  user = System.getenv('BINTRAY_USER')
+  key = System.getenv('BINTRAY_API_KEY')
+
+  dryRun = false
+  publish = true
+
+  publications = ['MyPublication']
+  pkg {
+    repo = 'maven'
+    name = "$ext_artifactId"
+    licenses = ['Apache-2.0']
+    labels = ['android', 'gradle-plugin']
+
+    publicDownloadNumbers = true
+    vcsUrl = "$ext_vcsUrl"
+
+    version {
+      name = "$ext_version"
+      desc = "$ext_description"
+      released  = new Date()
+      gpg {
+          sign = true // Determines whether to GPG sign the files.
+      }
+    }
+  }
+}