Add kotlin dsl gradle task configuration in gradletask.md (#3686)

* Add kotlin dsl gradle task configuration in gradletask.md
* Remove jcenter from gradle task configuration example in the docs

README.md

@@ -219,6 +219,7 @@ If you contributed to detekt but your name is not in the list, please feel free
 - [Krzysztof Kruczynski](https://github.com/krzykrucz) - Rule fix: ThrowingExceptionInMain, ExitOutsideMain
 - [Paya Do](https://github.com/payathedo) - Designer for Detekt's logo
 - [zmunm](https://github.com/zmunm) - New rule: ObjectLiteralToLambda
+- [Vinicius Montes Munhoz](https://github.com/vfmunhoz) - Documentation improvement
 - [Eliezer Graber](https://github.com/eygraber) - Rule fix: ModifierOrder
 - [Dominik Labuda](https://github.com/Dominick1993) - Gradle plugin improvement
 

docs/pages/gettingstarted/gradletask.md

@@ -9,7 +9,6 @@ summary:
 
 1. Add following lines to your build.gradle file.
 2. Run `gradle detekt`
-3. Add `check.dependsOn detekt` if you want to run _detekt_ on every `build`
 
 ###### Groovy DSL
 ```groovy
@@ -24,19 +23,49 @@ configurations {
 task detekt(type: JavaExec) {
 	main = "io.gitlab.arturbosch.detekt.cli.Main"
 	classpath = configurations.detekt
+
 	def input = "$projectDir"
 	def config = "$projectDir/detekt.yml"
 	def exclude = ".*/build/.*,.*/resources/.*"
 	def params = [ '-i', input, '-c', config, '-ex', exclude]
+
 	args(params)
 }
 
 dependencies {
 	detekt 'io.gitlab.arturbosch.detekt:detekt-cli:{{ site.detekt_version }}'
 }
+
+// Remove this line if you don't want to run detekt on every build
+check.dependsOn detekt
 ```
 
 ###### Kotlin DSL
 ```kotlin
-// TODO
+repositories {
+    mavenCentral()
+}
+
+val detekt by configurations.creating
+
+val detektTask = tasks.register<JavaExec>("detekt") {
+    main = "io.gitlab.arturbosch.detekt.cli.Main"
+    classpath = detekt
+
+    val input = projectDir
+    val config = "$projectDir/detekt.yml"
+    val exclude = ".*/build/.*,.*/resources/.*"
+    val params = listOf("-i", input, "-c", config, "-ex", exclude)
+
+    args(params)
+}
+
+dependencies {
+    detekt("io.gitlab.arturbosch.detekt:detekt-cli:{{ site.detekt_version }}")
+}
+
+// Remove this block if you don't want to run detekt on every build
+tasks.check {
+    dependsOn(detektTask)
+}
 ```